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/vd/readme.mdx

@@ -0,0 +1,63 @@
+---
+title: vd
+---
+
+The `vd` macro adds a _vertical dimension_ to your pattern.
+
+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('vd', {
+  String id = 'vd',
+  Point from,
+  Boolean noEndMarker,
+  Boolean noStartMarker,
+  String text,
+  Point to,
+  Number x,
+  Boolean force = false,
+})
+```
+
+## Example
+
+<Example caption="An example of a vertical dimension with the vd macro">
+```js
+({ Point, macro, Path, paths, part }) => {
+
+  macro('vd', {
+    from: new Point(0,0),
+    to: new Point(0,40),
+    x:10,
+    force: true,
+  })
+
+  // Prevent clipping
+  paths.diag = new Path()
+    .move(new Point(-20,0))
+    .move(new Point(90,40))
+
+  return part
+}
+```
+</Example>
+
+## Configuration
+
+| Property        | Default | Type                | Description |
+|----------------:|---------|---------------------|-------------|
+| `from`          |         | [Point](/reference/api/point) | The startpoint of the dimension |
+| `to`            |         | [Point](/reference/api/point) | The endpoint of the dimension |
+| `x`             |         | Number              | The X-value at which to draw the dimension |
+| `text`          | Vertical distance | Number    | The text to go on the dimension if not the from-to vertical distance |
+| `id`            | `vd` | `string` | The ID of this macro instance |
+| `noStartMarker` | `false` | Boolean             | Whether to not draw a start marker |
+| `noEndMarker`  | `false` | Boolean             | Whether to not draw an end marker |
+| `force`      | `false`    | `boolean`  | Set this to `true` to display the macro output even when `paperless` is `false` |
+
+## Notes
+
+This macro takes the `paperless` setting into account and won't output anything when both `paperless` and `force` are `false`.