chore: Port FreeSewing.dev to docusaurus

The replaces the NextJS site powering FreeSewing.dev with a Docusaurus
setup. It's part of my efforts to simplify FreeSewing's setup so we can
focus on our core value proposition.

sites/dev/docs/tutorials/getting-started-linux/dev-setup/readme.mdx

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+---
+title: Setting up the FreeSewing development environment
+order: 40
+---
+
+FreeSewing provides a development environment to help you design and develop
+patterns.
+
+There are two ways to run this development environment:
+
+- [**Monorepo development**](#monorepo-development): Use this if you intend to
+  contribute your work to FreeSewing
+- [**Stand-alone development**](#stand-alone-development): Use this if you want
+  to do your own thing, and not contribute to FreeSewing
+
+## Monorepo development
+
+:::note
+This is the recommended way for (aspiring) FreeSewing contributors
+:::
+
+### TL;DR
+
+```bash
+git clone https://github.com/freesewing/freesewing
+cd freesewing
+yarn kickstart
+```
+
+:::tip
+Even better: [clone your own
+fork](https://github.com/freesewing/freesewing/fork)
+
+```bash
+git clone https://github.com/your-username/freesewing
+cd freesewing
+yarn kickstart
+```
+:::
+
+This sets up the monorepo. If you would like to create a new design, run the
+following command:
+
+```sh
+yarn new design
+```
+
+If you'd like to create a new plugin, run this variant instead:
+
+```sh
+yarn new plugin
+```
+
+### Step by step
+
+:::note
+These docs assume you have git installed.
+But if you're running Linux, you have git, right?
+:::
+
+#### Install yarn
+
+Our repository uses yarn workspaces. So you'll need `yarn` to work with it.
+
+To install it run:
+
+```bash
+npm install yarn --global
+```
+
+#### Fork our repository
+
+You'll want to fork our repository. This way you have your own copy where you can make
+all the changes you want. To do so, visit https://github.com/freesewing/freesewing/fork
+
+#### Clone the forked repository
+
+Now that you have your very own fork, it's time to clone it locally.
+
+```bash
+git clone <url to your fork>
+```
+
+Make sure to use the URL to your own fork, typically `https://github.com/your-username/freesewing` but
+obviously with your real username rather than `your-username`.
+
+#### Install dependencies
+
+Enter the directory that was created, and run the `yarn kickstart` command:
+
+```bash
+cd freesewing
+yarn kickstart
+```
+
+Now you're ready to [start the development environment](/tutorials/getting-started-linux/dev-start).
+
+:::note
+
+There is another `yarn` command that comes with some Linux distributions,
+installed as part of the `cmdtest` package and used for command line
+scenario testing.
+If you get an `ERROR: There are no scenarios; must have at least one.`
+message when trying to run the `yarn` command, it may be because the wrong
+`yarn` is being used.
+
+Possible workarounds for this include uninstalling the `cmdtest` package
+or making sure that npm `yarn` is installed and comes first in your `PATH`
+environment variable.
+
+:::
+
+## Creating a new design
+
+If you would like to create a new design, run the following command:
+
+```sh
+yarn new design
+```
+
+## Creating a new plugin
+
+If you'd like to create a new plugin, run the following command:
+
+```sh
+yarn new plugin
+```
+
+## Stand-alone development
+
+With Node.js installed, all you need to do to setup the stand-alone development environment is run this command:
+
+```bash
+npx @freesewing/new-design
+```
+
+After you've answered [some questions](#questions), it will take a while to set
+everything up.  When it's done, you will have a new folder with the development
+environment inside.
+
+Now you're ready to [start the development
+environment](/tutorials/getting-started-linux/dev-start).
+
+:::tipThe folder will have the name you chose above.:::
+
+:::note
+
+### Questions
+
+#### What template to use
+
+Use `From scratch` unless you want to start from our of our blocks:
+
+- Use `Extend Brian` to start from [Brian](https://freesewing.org/designs/brian)
+- Use `Extend Bent` to start from [Bent](https://freesewing.org/designs/bent)
+- Use `Extend Bella` to start from [Bella](https://freesewing.org/designs/bella)
+- Use `Extend Breanna` to start from [Breanna](https://freesewing.org/designs/breanna)
+- Use `Extend Titan` to start from [Titan](https://freesewing.org/designs/titan)
+
+#### What name to use
+
+This will become the name of your design. Stick to \[a-z] here to avoid problems.
+
+If you're not certain what to pick, just mash some keys, it doesn't matter.
+
+#### What package manager to use
+
+You may wish to choose `yarn` since that is the package manager
+that we use when doing work in the monorepo,
+and many of our tutorials are written to use `yarn`.
+However, it doesn't really matter.
+You can choose either `yarn` or `npm` as you wish.
+
+:::

sites/dev/docs/tutorials/getting-started-linux/dev-start/readme.mdx

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+---
+title: Start the development environment
+order: 50
+---
+
+FreeSewing provides a development environment to help you design and develop patterns.
+
+There are two ways to run this development environment:
+
+- [**Monorepo development**](#monorepo-development): Use this if you intend to contribute your work to FreeSewing
+- [**Stand-alone development**](#stand-alone-development): Use this if you want to do your own thing, and not contribute to FreeSewing
+
+## Monorepo development
+
+Run `yarn lab` to start the development environment:
+
+```bash
+yarn lab
+```
+
+Then point your browser to http://localhost:8000
+
+:::tip
+### Adding a new design
+This is all you need to work on existing designs. If you'd like to add a new design, run:
+
+```bash
+yarn new design
+```
+
+Just make sure to re-start the lab afterwards with `yarn lab`
+:::
+
+## Stand-alone development
+
+You will have a new folder that has the name you picked for your design.
+If you chose `test`, you will have a folder named `test`.
+If you chose `banana`, you'll have a folder named `banana`.
+(Within this new folder, the `design` subfolder holds your design's configuration file and source code.
+You can ignore all other subfolders and files; they are part of the development environment.)
+
+To start the development environment, enter the folder that was created
+and run `yarn dev` (or `npm run dev` if you're using npm as a package manager).
+
+Then open your browser and go to http://localhost:8000
+
+:::tip
+The development environment will watch for any changes you make to
+the pattern's source code or configuration.
+When you do, it will update automatically in your browser.
+:::
+
+:::note
+
+##### Yay, you're done!
+
+All you have to do now is design your pattern.
+Thankfully, we have a tutorial for that too:
+
+- [Pattern design tutorial](/tutorials/pattern-design/): A step-by-step guide to designing your first pattern
+
+:::

sites/dev/docs/tutorials/getting-started-linux/installing-node/readme.mdx

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+---
+title: Installing Node.js
+order: 20
+---
+
+Now we will use `nvm` to install Node.js. Run the following command:
+
+```bash
+nvm install lts/hydrogen
+```
+
+This will install the so-called LTS version of Node.js 18 on your system.
+
+LTS versions -- short for Long Term Support -- are good Node.js versions
+to use because they are stable and supported for a long time.

sites/dev/docs/tutorials/getting-started-linux/installing-nvm/readme.mdx

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+---
+title: Installing nvm
+order: 10
+---
+
+FreeSewing is built with [Node.js](https://nodejs.org/), a JavaScript runtime.
+
+You'll need to install Node.js on your system, and to do so, we'll
+use [`nvm`](https://github.com/nvm-sh/nvm), short for _Node Version Manager_.
+
+Using `nvm` has a number of benefits in comparison with installing Node.js directly from
+the Node.js website, or from a package provided by your Linux distribution:
+
+- You can easily switch between different Node.js versions
+- Everything gets installed in your home folder, avoiding permission problems
+
+To setup `nvm`, [follow the install instructions in the nvm
+README](https://github.com/nvm-sh/nvm#installing-and-updating).
+
+After installation is completed, try running the following command:
+
+```bash
+nvm
+```
+
+If all goes well, it should show you the `nvm` help.
+
+:::tip
+
+If you get `nvm: command not found` or something similar, close the current terminal
+window, and open a new one. Now `nvm` should be found.
+
+:::

sites/dev/docs/tutorials/getting-started-linux/node-versions/readme.mdx

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+---
+title: Using a different Node.js version
+order: 30
+---
+
+Now that you've got Node.js setup, we can start setting up the FreeSewing
+development environment.
+
+But before doing so, let's look at how `nvm` can help you juggle different
+Node.js versions.
+
+### nvm ls
+
+To see the different Node.js versions on your system, run this command:
+
+```bash
+nvm ls
+```
+
+It will show you a list of local Node.js versions,
+either the version number or an _alias_ that points to a specific version.
+You should see the `lts/*` alias in the list which is what we've just installed.
+
+### nvm ls-remote
+
+To see all Node.js versions that are available, not just those you have locally,
+run this command:
+
+```bash
+nvm ls-remote
+```
+
+It will spit out a long list of Node.js versions that you can install.
+
+### nvm install
+
+For any of these versions, either local or remote, you can install them
+by making a note of the version or alias and running this command:
+
+```bash
+nvm install <version-or-alias>
+```
+
+### nvm use
+
+With multiple Node.js versions installed, `nvm` allows you to switch between different
+versions. Just tell it which version you want to use:
+
+```bash
+nvm use lts/hydrogen
+```
+
+If you picked a version that is not installed, `nvm` will simply tell you
+and even suggest the command you should type to install it. Handy!

sites/dev/docs/tutorials/getting-started-linux/readme.mdx

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+---
+title: Getting started on Linux
+order: 15
+---
+
+In this tutorial, we will setup Node.js and initialize the FreeSewing
+development environment on a Linux system.
+
+We'll cover the following steps:
+
+<ReadMore />
+
+:::tipThese instructions are also valid for BSD or other Unix systems:::