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/part/readme.mdx

@@ -0,0 +1,73 @@
+---
+title: Part
+---
+
+A `Part` in FreeSewing holds all data, logic, and configuration of a Design.
+Parts truly are the building blocks of FreeSewing as they not only provide
+the configuration, but also a `draft()` method that does the actual work
+of drafting a parametric design.
+
+## Properties
+
+A Part object comes with the following properties:
+
+- `attributes` : An [Attributes](/reference/api/attributes) instance holding
+  the part's attributes
+- `hidden` : When this is `true` the part will be hidden (excluding it from the
+  output).  See [Part.hide()](/reference/api/part/hide),
+  [Part.unhide()](/reference/api/part/unhide), and
+  [Part.setHidden()](/reference/api/part/sethidden) for various methods that
+  allow setting this in a chainable way.
+- `name` : The name of the part
+- `paths` : Holds the paths used in the part
+- `points` : Holds the points used in the part
+- `snippets` : Holds the snippets used in the part
+
+:::note RELATED
+See [Using Attributes](/howtos/code/attributes)
+for information about custom Attributes that can be used with Parts.
+:::
+
+## Example
+
+```js
+const part = {
+  name: 'example.part',
+  from: otherPart,
+  after: [ yetAnotherPart, oneMorePart ],
+  measurements: ['head', 'chest' ],
+  optionalMeasurements: ['neck'],
+  options: {
+    headEase: { pct: 12, min: 5, max: 20 }
+  }
+  hide: false,
+  hideAll: false,
+  hideDependencies: true,
+  plugins: [ 
+    plugin1, 
+    plugin1, 
+    [ plugin3, dataForPlugin3 ],
+  ],
+  draft: ({ part }) => part
+}
+```
+
+## Methods
+
+A Part object exposes the following methods:
+
+- [Part.asRenderProps()](/reference/api/part/asrenderprops)
+- [Part.attr()](/reference/api/part/attr)
+- [Part.getId()](/reference/api/part/getid)
+- [Part.hide()](/reference/api/part/hide)
+- [Part.setHidden()](/reference/api/part/sethidden)
+- [Part.shorthand()](/reference/api/part/shorthand)
+- [Part.unhide()](/reference/api/part/unhide)
+- [Part.units()](/reference/api/part/units)
+
+## More information
+
+Click below to learn more about:
+
+- [A part's configuration](/reference/api/part/config)
+- [A part's `draft()` method](/reference/api/part/draft)