docs: port to VitePress

Things that happen in this shameless squash:
- Removed 404 page
  - It doesn't work in VitePress and making it work in VitePress needs
    some invasive hack in the theme that I'm not willing to do
  - The default is more than enough, though
- Moved consoleVersionSelect include to another directory
  - This avoids being uploaded to Crowdin for translation
- Inline all SafeB9SInstaller includes
  - Not only do parameterized includes not work, but if/else statements
    don't work at all
- The sysupdate include parameter hasn't been used since MSET9, so it
  actually works just fine without any parameters. Hooray(?)
- Move mset9-chorus to an include, that logic doesn't work in VitePress
- Removed Get Started button from homepage, it breaks translations
- Tables in get-started are now shown by default; it seems VitePress really does
  not want us to use inline script. So we cannot enable it upon
  realizing that the browser is JS capable
- Include parameters are now in frontmatter to allow translation
- Hacked in a bunch of CSS values kanged from the old theme to make it
  look not stupid
- Drop headers down one level to make table of contents work

docs/file-extensions-(windows).md

@@ -1,49 +1,60 @@
----
-title: "File Extensions (Windows)"
----
+# File Extensions (Windows)
 
-{% include toc title="Table of Contents" %}
-
-### Required Reading
+## Required Reading
 
 This is an add-on section for disabling Windows's default behavior of hiding file extensions.
 
 This will make it easier for you to find the referenced files in the rest of this guide.
 
-### Instructions
+## Instructions
 
-#### Windows 11
+### Windows 11
 
 1. Launch File Explorer by opening any directory, such as your SD card directory
 1. Click the "View" option in the toolbar
 1. Go to "Show"
 1. Click "File name extensions" to enable it
 
-    ![]({{ "/images/screenshots/windows-11-file-extensions.png" | absolute_url }})
-    {: .notice--info}
+    ::: info
 
-#### Windows 10 / 8.1 / 8
+    ![](/images/screenshots/windows-11-file-extensions.png)
+
+    :::
+
+### Windows 10 / 8.1 / 8
 
 1. Launch File Explorer by opening any directory, such as your SD card directory
 1. Click the "View" option on the ribbon menu
 1. Check the box labeled "File name extensions"
 
-    ![]({{ "/images/screenshots/windows-10-file-extensions.png" | absolute_url }})
-    {: .notice--info}
+    ::: info
 
-#### Windows 7
+    ![](/images/screenshots/windows-10-file-extensions.png)
+
+    :::
+
+### Windows 7
 
 1. Open the start menu by clicking on it or using the Windows key
 1. Search for "Folder Options" and select the corresponding result
 
-    ![]({{ "/images/screenshots/windows-7-folder-options-start-menu.png" | absolute_url }})
-    {: .notice--info}
+    ::: info
+
+    ![](/images/screenshots/windows-7-folder-options-start-menu.png)
+    
+    :::
 
 1. Click the "View" option at the top of the Folder Options menu
 1. Uncheck the box labeled "Hide extensions for known file types"
 
-    ![]({{ "/images/screenshots/windows-7-folder-options.png" | absolute_url }})
-    {: .notice--info}
+    ::: info
 
-### Continue to [Get Started](get-started)
-{: .notice--primary}
+    ![](/images/screenshots/windows-7-folder-options.png)
+    
+    :::
+
+::: tip
+
+Continue to [Get Started](get-started)
+
+:::