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/offset/readme.mdx

@@ -0,0 +1,52 @@
+---
+title: Path.offset()
+---
+
+The `Path.offset()` method returns a new Path that is offset by distance from
+the original path.
+
+## Signature
+
+```js
+Path path.offset(float distance)
+```
+
+## Example
+
+<Example caption="Example of the Path.offset() method">
+```js
+({ Point, points, Path, paths, part }) => {
+
+  points.A = new Point(45, 60)
+  points.B = new Point(10, 30)
+  points.BCp2 = new Point(40, 20)
+  points.C = new Point(90, 30)
+  points.CCp1 = new Point(50, -30)
+
+  paths.example = new Path()
+    .move(points.A)
+    .line(points.B)
+    .curve(points.BCp2, points.CCp1, points.C)
+    .line(points.A)
+    .close()
+
+  paths.offset = paths.example
+    .offset(-10)
+    .attr("class", "interfacing")
+
+  paths.lineOffset = new Path()
+    .move(points.A)
+    .line(points.B)
+    .offset(-5)
+    .attr("class", "various")
+
+  paths.curveOffset = new Path()
+    .move(points.B)
+    .curve(points.BCp2, points.CCp1, points.C)
+    .offset(-5)
+    .attr("class", "canvas")
+
+  return part
+}
+```
+</Example>