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/howtos/git/editing-content-on-github/readme.mdx

@@ -0,0 +1,102 @@
+---
+title: Editing FreeSewing content on GitHub
+---
+
+## Introduction
+
+This 'How to' is designed to help get you started editing content using the
+[GitHub website](https://github.com/freesewing).
+
+GitHub stores a lot of FreeSewing content, it allows anyone to suggest
+edits, and helps the contributors to review and implement approved changes.
+
+If you are new to GitHub, you will need to [create an
+account](https://github.com/signup?user_email=\&source=form-home-signup)
+(they are free).
+
+:::note
+It is also possible to make changes using the GitHub desktop
+application and/or your computer's command line; these advanced topics are
+beyond the scope of this 'How to'.
+:::
+
+All pattern instructions and web pages (including this 'How to') are written in
+_Markdown_. Please see our [Markdown
+guide](https://freesewing.dev/guides/markdown) for more information on this.
+
+For security, most contributors don't have permission to change the code.
+Instead we must follow three steps to make edits:
+
+1. [_Fork_ (create a copy of) the repository](#fork-the-repository).  This will
+   be your own copy and you can make all the changes you want.
+2. [Make the edits](#make-the-edits).
+3. [Save your edits and submit a _pull
+   request_](#save-your-edits-and-submit-a-pull-request) to let the admins know
+   about your changes. This says _"hey, I made some changes. I think you might
+   like them and consider them for inclusion into your (original) repository."_
+
+The GitHub documentation provides a more [detailed
+explanation](https://docs.github.com/en/get-started/quickstart/fork-a-repo),
+but this guide should be enough to help you get started.
+
+## Fork the repository
+
+- On GitHub.com, navigate to the FreeSewing
+  [repository](https://github.com/freesewing/freesewing)
+- In the top-right corner of the page, click **Fork**
+![Fork button](fork_button.png)
+- Click the **Create fork** button.
+![Create fork button](fork-create-button.png)
+
+## Make the edits
+
+- Navigate to the folder containing the file that you want to edit.
+
+To help you understand how the repository is organised, here is the path to the
+Simone instructions:
+`freesewing/markdown/org/docs/patterns/simone/instructions`  This folder
+contains several files, one for each language.
+![Path to Simone instructions](simone-instructions-path.png)
+
+- Select on the file you want to update.
+
+:::warning
+
+Please only edit the English language files (called `en.md`),
+our translation software will handle the other languages.
+
+:::
+- Click on the **Edit** button.
+![edit button image](edit-button.png)
+
+:::note
+Clicking **Preview** will show what your changes will look like.
+
+![Edit and preview buttons](edit-preview-buttons.png)
+:::
+
+## Save your edits and submit a pull request
+
+When you are happy with your edits:
+
+- Scroll to the bottom of the page and enter a brief description of your edits.
+  This will help us know what has changed.
+- Click the **Commit changes** button. This is similar to saving a snapshot of
+  your edits.
+  ![Commit changes](commit-changes.png)
+
+Now you will create a _pull request_ to let the admins know your edits are
+ready for review:
+
+- Navigate to the repository where you created your fork.
+- Above the list of files, click the **Pull request** button.
+![Pull request button](pull-request-button.png)
+
+Congratulations - you have just submitted your first edits to the site
+maintainers!
+
+You can keep track of the progress of your changes in GitHub or in the
+[github-updates
+channel](https://discord.com/channels/698854858052075530/836689608820916234) on
+our Discord server.
+![github updates channel image](discord-github-updates.png)