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/shifttowards/readme.mdx

@@ -0,0 +1,47 @@
+---
+title: Point.shiftTowards()
+---
+
+The `Point.shiftTowards()` method returns a new `Point` that is shifted
+`distance` (mm) in the direction of the `target`.
+
+## Signature
+
+```js
+Point point.shiftTowards(Point target, float distance)
+```
+
+## Example
+
+<Example caption="An example of the Point.shiftTowards() method">
+```js
+({ Point, points, Path, paths, macro, part }) => {
+
+  points.A = new Point(90, 70).setText("Point A", "right text-sm")
+  points.B = new Point(10, 10).setText("Point B", "text-sm")
+  points.C = points.A.shiftTowards(points.B, 35)
+    .setText("Point C is point A shifted 3.5 cm\nin the direction of point B", "center, text-sm")
+    .attr("data-text-lineheight", 6)
+
+  paths.direction = new Path()
+    .move(points.A)
+    .line(points.B)
+    .addClass("note dashed")
+
+  macro("ld", {
+    from: points.C,
+    to: points.A,
+    d: -10
+  })
+
+  return part
+}
+```
+</Example>
+
+
+## Notes
+
+If you need to move a point a percentage instead of a specific distance, use
+[`Point.shiftFractionTowards()`](/reference/api/point/shiftfractiontowards/)
+instead.