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

@@ -0,0 +1,174 @@
+---
+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.
+
+:::