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/ld/readme.mdx

@@ -0,0 +1,58 @@
+---
+title: ld
+---
+
+The `ld` macro adds a _linear 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('ld', {
+  Number d,
+  String id = 'ld',
+  Point from,
+  Boolean noEndMarker,
+  Boolean noStartMarker,
+  String text,
+  Point to,
+  Boolean force = false,
+})
+```
+
+## Example
+
+<Example caption="An example of a linear dimension with the ld macro">
+```js
+({ Point, macro, part }) => {
+
+  macro('ld', {
+    from: new Point(0,0),
+    to: new Point(100,20),
+    d:15,
+    force: true,
+  })
+
+  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 |
+| `d`             | 0       | Number              | The offset at which to draw the dimension |
+| `id`            | `ld`    | `string`            | The ID of this macro instance |
+| `text`          | Linear distance   | Number    | The text to go on the dimension if not the from-to linear distance |
+| `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`.