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/api/point/angle/readme.mdx

@@ -0,0 +1,38 @@
+---
+title: Point.angle()
+---
+
+The `Point.angle()` method returns the angle (in degrees) between this point
+and the point passed into the method. An angle of 0° points to the right, and
+the angle increases counterclockwise.
+
+## Signature
+
+```js
+float point.angle(Point pointB)
+```
+
+## Example
+
+<Example caption="An example of the Point.angle() method">
+```js
+({ Point, points, Path, paths, part }) => {
+
+  points.sun = new Point(10, 5)
+  points.moon = points.sun.shift(-15, 70)
+  points.text = points.sun
+    .shiftFractionTowards(points.moon, 0.8)
+    .setText(
+      points.sun.angle(points.moon)+"°",
+      "text-sm fill-note center"
+    )
+
+  paths.line = new Path()
+    .move(points.sun)
+    .line(points.moon)
+    .setClass("dashed")
+
+  return part
+}
+```
+</Example>