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/howtos/code/adding-points/readme.mdx

@@ -0,0 +1,26 @@
+---
+title: Adding points
+---
+
+Points should be stored in the `points` key of the object passed to your part's
+draft method. The constructor for points is available in the `Point` key. You
+can destructure them for easy access.
+
+<Example caption="An example of adding a point" tutorial>
+```design/src/part.mjs
+function draftPart = ({ 
+  // highlight-start
+  Point,
+  points,
+  // highlight-end
+  part 
+}) {
+
+  // highlight-start
+  points.demo = new Point(0,0).addText('hi')
+  // highlight-end
+
+  return part
+}
+```
+</Example>