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/svg/asrenderprops/readme.mdx

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+---
+title: Svg.asRenderProps()
+---
+
+The `Svg.asRenderProps()` method will return the data stored in the
+svg as a serializable JavaScript object. This method is typically
+not invoked directly but rather called under the hood as a result of
+calling [`Pattern.getRenderProps()`](/reference/api/pattern/getrenderprops).
+
+## Signature
+
+```js
+Object svg.asRenderProps()
+```
+
+## Returned object properties
+
+The returned JavaScript object has the following properties:
+
+| Name | Description |
+| ----:| ----------- |
+| `attributes` | The result of [Path.attributes.asRenderProps()](/reference/api/attributes/asrenderprops) |
+| `layout` | A plain object describing the layout of the SVG |
+| `body` | A string holding the SVG body |
+| `style` | A string holding the SVG style |
+| `defs` | A string holding the SVG defs |
+

sites/dev/docs/reference/api/svg/attributes/readme.mdx

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+---
+title: Svg.attributes
+---
+
+The `Svg.attributes` property holds an [Attributes](/reference/api/attributes)
+instance to control the attributes of the SVG document.

sites/dev/docs/reference/api/svg/defs/readme.mdx

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+---
+title: Svg.defs
+---
+
+The `Svg.defs` property holds a [Defs object](/reference/api/defs) that holds
+the contents of [the defs
+section](https://developer.mozilla.org/en-US/docs/Web/SVG/Element/defs) of the
+SVG document.
+
+## Signature
+
+```svg
+<defs>
+  /* svg.defs will be inserted */
+</defs>
+```

sites/dev/docs/reference/api/svg/layout/readme.mdx

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+---
+title: Svg.layout
+---
+
+The `Svg.layout` property holds an object that holds rendered SVG for all
+parts, and a list of their transforms.
+
+## Signature
+
+```js
+{
+  back: {
+    svg: "( Holds rendered SVG for this part )",
+    transforms: [ "translate(2, 2)" ]
+  },
+  // Other parts follow
+}
+```

sites/dev/docs/reference/api/svg/pattern/readme.mdx

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+---
+title: Svg.pattern
+---
+
+The `Svg.pattern` property holds a reference to [the Pattern
+object](/reference/api/pattern/) itself.
+
+## Notes
+
+This allows hooks that only receive the SVG object (such as the preRender and
+postRender hooks) to still access the pattern object.

sites/dev/docs/reference/api/svg/readme.mdx

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+---
+title: Svg
+---
+
+The `Svg` object in FreeSewing's core library represents an SVG document.
+It is not directly exposed, but it is available as the `svg` attribute
+of a [Pattern object](/reference/api/pattern/).
+
+While the methods exposed by this object are only used internally,
+its attributes are useful for situations where you
+want to develop a plugin, or use a custom layout.
+
+## Svg methods & properties
+
+<ReadMore />

sites/dev/docs/reference/api/svg/render/readme.mdx

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+---
+title: Svg.render()
+---
+
+The `Svg.render()` method will render a drafted
+[Pattern](/reference/api/pattern) as SVG.
+
+## Signature
+
+```js
+string svg.render()
+```
+
+:::warning
+
+This method is mostly internal and should not be used directly.
+Instead, it is intended that the
+[Pattern.render()](/reference/api/pattern/render)
+method be used to render patterns as SVG.
+
+:::

sites/dev/docs/reference/api/svg/style/readme.mdx

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+---
+title: Svg.style
+---
+
+The `Svg.style` property holds a string that will be rendered as the style
+section of the SVG document.
+
+## Signature
+
+```svg
+<style type="text/css">
+  /* svg.style will be inserted */
+</style>
+```
+
+## Notes
+
+The style property is where plugins will add additional styling.
+
+When adding your own styles, it's important not to
+overwrite this property, but rather add your own.
+
+In other words, do this:
+
+```js
+svg.style += myStyles
+```
+
+and don't do this:
+
+```js
+svg.style = myStyles
+```