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/path/circlesegment/readme.mdx

@@ -0,0 +1,52 @@
+---
+title: Path.circleSegment()
+---
+
+The `Path.circleSegment()` method draws a circle segment
+starting from the current endpoint of the path around the given origin with a given angle.
+
+A positive angle results in a counter-clockwise arc.
+
+A negative angle results in a clockwise arc.
+
+:::tip
+The new endpoint of this path is the same point
+that 
+```js
+path.end().rotate(deg, origin)
+```
+would return.
+:::
+
+## Signature
+
+```js
+Path path.circleSegment(deg, origin)
+```
+
+:::tipThis method is chainable as it returns the `Path` object:::
+
+## Example
+
+<Example caption="Example of the Path.circleSegment() method">
+```js
+({ Point, points, Path, paths, part }) => {
+
+points.from = new Point(10, 20)
+points.origin = new Point(40, 0)
+
+paths.line = new Path()
+.move(points.from)
+.circleSegment(90, points.origin)
+.setText("→ Path.circleSegment() →", "text-sm center fill-note")
+
+paths.helper = new Path()
+.move(paths.line.start())
+.line(points.origin)
+.line(paths.line.end())
+.setClass('dotted stroke-sm')
+
+return part
+}
+```
+</Example>