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/tutorials/pattern-design/part2/our-first-part/readme.mdx

@@ -0,0 +1,89 @@
+---
+title: Creating a part
+order: 20
+---
+
+Much like garments themselves, patterns are made up of _parts_.
+Most patterns will have multiple parts. A sleeve, a back part, the collar, and
+so on. The pattern you create today is very simple, and only has one part: the bib.
+
+:::tip
+
+It's a good idea to keep each part in its own file. You don't *have to* do
+this, but it's a good habit to get into. 
+
+:::
+
+## bib.mjs
+
+I am going to use the **From scratch** template. So the files I want to edit live 
+in `design/from-scratch`.
+
+Our part lives in `design/from-scratch/src/bib.mjs`, and it currently looks like this:
+
+```src/bib.mjs
+function draftBib({ part }) {
+  return part
+}
+
+export const bib = {
+  name: 'fromscratch.bib',
+  draft: draftBib,
+}
+```
+
+## The part object
+
+Each part in FreeSewing is an object that describes the part, and has a `draft`
+method to do the actual work of drafting the part.
+
+The only mandatory keys on a part object are `name` and `draft`.
+
+:::note RELATED
+
+Refer to [the part reference documentation](/reference/api/part) for 
+all details about configuring the part object 
+:::
+
+:::note
+
+A design in FreeSewing is a thin wrapper around a collection of parts.
+Each parts stands on its own, and parts from various designs can be combined
+to create other designs.
+:::
+
+
+### The part name
+
+```src/bib.mjs
+  name: 'fromscratch.bib',
+```
+
+A part's `name` should be unique in a design. I used `fromscratch.bib` as the
+name, because that makes sense.
+
+:::warning
+
+I **strongly** recommend that you apply the same `designName.partName` naming scheme in all your parts.
+This avoids naming conflicts when mixing parts from various designs to create a new design.
+
+:::
+
+### The part's draft method
+
+```src/bib.mjs
+  draft: draftBib,
+```
+
+The second mandatory key on the part object is `draft` which should hold the method that drafts the part.
+
+In the example above, it refers to the `draftBib` function that was defined at the top of the same `bib.mjs` file.
+
+For now this function doesn't do much, but that will change soon enough.
+
+:::note
+This structure of putting the draft method at the top of the file and
+the part object at the bottom is a bit of a convention in FreeSewing.
+:::
+
+We'll take a deeper look at our part's draft method soon. For now, let's look at adding measurements to our part.