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/pointoncurve/readme.mdx

@@ -0,0 +1,65 @@
+---
+title: utils.pointOnCurve()
+---
+
+The `utils.pointOnCurve()` function returns `true` if the point `check` lies on a
+curve described by points `start`, `cp1`, `cp2`, and `end`.
+
+## Signature
+
+```js
+bool utils.pointOnCurve(
+  Point start, 
+  Point cp1, 
+  Point cp2, 
+  Point end, 
+  Point check
+)
+```
+
+## Example
+
+<Example caption="A Utils.pointOnCurve() example">
+```js
+({ Point, points, Path, paths, Snippet, snippets, getId, utils, part }) => {
+
+  points.start = new Point(10, 10)
+  points.cp1 = new Point(90, 10)
+  points.cp2 = new Point(10, 60)
+  points.end = new Point(90, 60)
+  
+  const scatter = []
+  for (let i = 1; i < 19; i++) {
+    for (let j = 1; j < 14; j++) {
+      scatter.push(new Point(i * 10, j * 10))
+    }
+  }
+  let snippet
+  for (let point of scatter) {
+    if (
+      utils.pointOnCurve(
+        points.start,
+        points.cp1,
+        points.cp2,
+        points.end,
+        point
+      )
+    ) {
+      snippet = "notch"
+    } else snippet = "bnotch"
+    snippets[getId()] = new Snippet(snippet, point)
+  }
+  paths.curve = new Path()
+    .move(points.start)
+    .curve(points.cp1, points.cp2, points.end)
+    .addClass("fabric stroke-lg")
+
+  return part
+}
+```
+</Example>
+
+
+## Notes
+
+Keep in mind that calculations with Bézier curves are often approximations.