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/utils/beamintersectscircle/readme.mdx

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+---
+title: utils.beamIntersectsCircle()
+---
+
+The `utils.beamIntersectsCircle()` function finds the intersection between an
+endless line through points `point1` and `point2` and a circle with its center
+at point `center` and a radius of `radius` mm.
+
+## Signature
+
+```js
+array | false utils.beamIntersectsCircle(
+  Point center, 
+  float radius, 
+  Point point1, 
+  Point point1, 
+  string sort=x
+)
+```
+
+The 5th and last parameter controls the _sorting_ of the found intersections.
+This will (almost) always return 2 intersections, and you can choose how
+they are ordered in the returned array:
+
+Set sort to:
+
+- `x` : The point with the lowest X-coordinate will go first (left to right)
+- `y` : The point with the lowest Y-coordinate will go first (top to bottom)
+
+## Example
+
+<Example caption="A utils.beamIntersectsCircle() example">
+```js
+({ Point, points, Path, paths, Snippet, snippets, utils, part }) => {
+
+  points.A = new Point(45, 45)
+    .addCircle(35, "Fabric")
+  points.B = new Point(5, 50)
+  points.C = new Point(25, 30)
+  points.D = new Point(5, 65)
+  points.E = new Point(65, 5)
+  points.F = new Point(15, 75)
+  points.G = new Point(75, 15)
+  
+  paths.line1 = new Path().move(points.B).line(points.C)
+  paths.line2 = new Path().move(points.D).line(points.E)
+  paths.line3 = new Path().move(points.F).line(points.G)
+  
+  let intersections1 = utils.beamIntersectsCircle(
+    points.A,
+    points.A.attributes.get("data-circle"),
+    points.B,
+    points.C
+  )
+  let intersections2 = utils.beamIntersectsCircle(
+    points.A,
+    points.A.attributes.get("data-circle"),
+    points.D,
+    points.E,
+    "y"
+  )
+  let intersections3 = utils.beamIntersectsCircle(
+    points.A,
+    points.A.attributes.get("data-circle"),
+    points.F,
+    points.G
+  )
+  
+  snippets.first1 = new Snippet("bnotch", intersections1[0])
+  snippets.second1 = new Snippet("notch", intersections1[1])
+  snippets.first2 = new Snippet("bnotch", intersections2[0])
+  snippets.second2 = new Snippet("notch", intersections2[1])
+  snippets.first3 = new Snippet("bnotch", intersections3[0])
+  snippets.second3 = new Snippet("notch", intersections3[1])
+
+  return part
+}
+```
+</Example>
+