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/round/readme.mdx

@@ -0,0 +1,60 @@
+---
+title: round
+---
+
+The `round` macro creates a rounded corner.
+
+It is provided by [plugin-round](/reference/plugins/round), which is
+part of [core-plugins](/reference/plugins/core) (so it is available by default).
+
+## Signature
+
+```js
+macro('round', { 
+  String id = 'round',
+  String class,
+  Point from,
+  Boolean hide,
+  String prefix,
+  Number radius,
+  Point to,
+  Point via,
+})
+```
+
+## Example
+
+<Example caption="An example of the round macro">
+```js
+({ Point, points, macro, part }) => {
+
+  macro('round', {
+    from: new Point(0, 0),
+    to: new Point(100, 40),
+    via: new Point(100, 0),
+    radius: 30,
+    hide: false,
+  })
+
+  return part
+}
+```
+</Example>
+
+## Configuration
+
+| Property    | Default | Type                | Description |
+|------------:|---------|---------------------|-------------|
+| `id`        | `round` | `string` | The ID of this macro instance |
+| `from`      |         | [Point](/reference/api/point) | The startpoint towards the corner to round |
+| `to`        |         | [Point](/reference/api/point) | The endpoint away from the corner to round |
+| `via`       |         | [Point](/reference/api/point) | The cornerpoint to round |
+| `radius`    | Maximum | Number              | The radius in mm if not the maximum possible |
+| `prefix`    |         | String              | A prefix to give to the points and paths created by this macro |
+| `hide`      | `true`  | Boolean             | Whether to hide the path created by this macro |
+| `class`     |         | String              | Class(es) to assign to the path created by this macro |
+
+
+## Notes
+
+This macro is only intended for 90 degree corners.