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/reference/macros/scalebox/readme.mdx

@@ -0,0 +1,60 @@
+---
+title: scalebox
+---
+
+The `scalebox` macro adds a _scale box_ to your pattern. This box allows users
+to verify their pattern is printed to scale.
+The white inside of the box provides a metric scale, and the black outside
+of the box provides an imperial scale.
+
+It is provided by [plugin-annotations](/reference/plugins/annotations), which is
+part of [core-plugins](/reference/plugins/core) (so it is available by default).
+
+## Signature
+
+```js
+macro('scalebox', {
+  String id = 'scalebox',
+  Point at,
+  String lead,
+  Number rotate,
+  String text,
+  String title,
+  Boolean force = false,
+})
+```
+
+## Example
+
+<Example caption="An example of the scalebox macro">
+```js
+({ Point, macro, part }) => {
+
+  macro('scalebox', {
+    at: new Point(0,0),
+    title: 'This is the title',
+    number: 666,
+  })
+
+  return part
+}
+```
+</Example>
+
+## Configuration
+
+| Property    | Default | Type                | Description |
+|------------:|---------|---------------------|-------------|
+| `id`        | `scalebox` | `string` | The ID of this macro instance |
+| `at`        |         | [Point](/reference/api/point) | The point to anchor the _scale box_ on |
+| `lead`      | FreeSewing | String           | The lead text above the title |
+| `title`     | _pattern name + version_ | String | The title text |
+| `text`      | (\*)    | String              | The text below the title |
+| `rotate`    | 0       | Number              | Rotation in degrees |
+| `force`      | `false`    | `boolean`  | Set this to `true` to display the macro output even when `complete` is `false` |
+
+(\*) `freesewingIsMadeByJoostDeCockAndContributors \n withTheFinancialSupportOfOurPatrons`
+
+## Notes
+
+This macro takes the `complete` setting into account and won't output anything when both complete and `force` are `false`.