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/sitsroughlyon/readme.mdx

@@ -0,0 +1,46 @@
+---
+title: Point.sitsRoughlyOn()
+---
+
+The `Point.sitsRoughlyOn()` method returns `true` if this point has roughly
+(rounded to the nearest millimeter) the same coordinates as the one you pass to
+it.
+
+## Signature
+
+```js
+bool point.sitsRoughlyOn(Point check)
+```
+
+## Example
+
+<Example caption="An example of the Point.sitsRoughlyOn() method">
+```js
+({ Point, points, Path, paths, Snippet, snippets, part }) => {
+
+  let s
+  for (let i = 0; i < 10; i++) {
+    points[`a${i}`] = new Point(i * 10, 40)
+    points[`b${i}`] = new Point(i * 10, i * 8)
+    if (points[`a${i}`].sitsRoughlyOn(points[`b${i}`])) s = "notch"
+    else s = "bnotch"
+    snippets[`b${i}`] = new Snippet(s, points[`b${i}`])
+    snippets[`a${i}`] = new Snippet(s, points[`a${i}`])
+  }
+
+  // Prevent clipping
+  paths.diag = new Path()
+    .move(new Point(0,0))
+    .move(new Point(90,70))
+
+  return part
+}
+```
+</Example>
+
+
+## Notes
+
+The difference between this method and
+[`Point.sitsOn()`](/reference/api/point/sitson/) is that this one rounds things
+down to the nearest integer (thus mm) before checking.