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/attributes/readme.mdx

@@ -0,0 +1,35 @@
+---
+title: Attributes
+---
+
+An Attributes object holds attributes for a variety of other objects.
+
+## Signature
+
+```js
+Attributes new Attributes()
+```
+
+The Attributes constructor takes no arguments.
+
+## Properties
+
+An Attributes object comes with the following property:
+
+- `list` : Holds the internal object in which attributes are stored
+
+## Methods
+An Attributes object exposes the following methods:
+
+<ReadMore />
+
+## Notes
+
+Attributes are attached to [`Point`](/reference/api/point),
+[`Path`](/reference/api/path), and [`Snippet`](/reference/api/snippet) objects,
+as well as the internal [`Svg`](/reference/api/svg) object.
+
+All of these have an instantiated Attributes object in their `attributes`
+property, as well as a number of (chainable) helper methods to manipulate the
+attributes. You will typically use these higher-level method and thus are
+unlikely to interact with an Attributes object directly.