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/sprinkle/readme.mdx

@@ -0,0 +1,58 @@
+---
+title: sprinkle
+---
+
+The `sprinkle` macro facilitates adding snippets to your pattern in bulk.
+
+It is provided by [plugin-sprinkle](/reference/plugins/sprinkle), which is
+part of [core-plugins](/reference/plugins/core) (so it is available by default).
+
+## Signature
+
+```js
+macro('sprinkle', {
+  Array on,
+  Number scale,
+  Snippet snippet,
+  Number rotation,
+})
+```
+
+## Example
+
+<Example caption="An example of the sprinkle macro">
+```js
+({ Point, points, Path, paths, macro, part }) => {
+
+  points.a = new Point(0,0)
+  points.b = new Point(10,5)
+  points.c = new Point(20,0)
+  points.d = new Point(30,5)
+  points.e = new Point(40,0)
+  points.f = new Point(50,5)
+  points.g = new Point(60,0)
+
+  macro('sprinkle', {
+    snippet: 'button',
+    on: ['a', 'b', 'c', 'd', 'e', 'f', 'g']
+  })
+
+  // Prevent clipping
+  paths.diag = new Path()
+    .move(points.a)
+    .move(new Point(points.g.x, points.g.y + 5))
+
+  return part
+}
+```
+</Example>
+
+## Configuration
+
+| Property    | Default | Type             | Description |
+|------------:|---------|------------------|-------------|
+| `snippet`   |         | String           | Name of the Snippet to sprinkle |
+| `on`        | `[]`    | Array of strings | Array of pointnames, the names of Points in the `points` array to add the Snippets on |
+| `scale`     | 1       | number           | Scale for the individual Snippets |
+| `rotate`    | 0       | number           | Rotation for the individual Snippets |
+