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/stack/addpart/readme.mdx

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+---
+title: Stack.addPart()
+---
+
+The `Stack.addPart()` method adds a part to the stack and returns the
+original stack.
+
+## Stack.addPart() signature
+
+```js
+Stack stack.addPart(Part part)
+```
+
+:::noteThis method is chainable as it returns the Stack object:::

sites/dev/docs/reference/api/stack/asrenderprops/readme.mdx

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+---
+title: Stack.asRenderProps()
+---
+
+The `Stack.asRenderProps()` method returns a stack object suitable for renderprops.
+
+
+## Stack.asProps() signature
+
+```js
+Object stack.asProps()
+```
+
+## Stack.asProps() returned object
+
+The `Stack.asProps()` method returns an object with the following properties:
+
+| Property | Description |
+| --------:| ----------- |
+| `attributes` | An `Attributes` instance holding the stack's attributes |
+| `bottomRight` | A `Point` that is the bottom right of the stack's bounding box |
+| `height` | Height of the bounding box of the stack in `mm` |
+| `name` | The name of the stack |
+| `parts` | An `Array` of the `Part`s in the stack |
+| `topLeft` | A `Point` that is the top left of the stack's bounding box |
+| `width` | Width of the bounding box of the stack in `mm` |

sites/dev/docs/reference/api/stack/attr/readme.mdx

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+---
+title: Stack.attr()
+---
+
+The `Stack.attr()` method adds an attribute to the stack
+and returns the original stack.
+Setting the third parameter to `true` will replace the value of the
+attribute instead of adding it.
+
+## Stack.attr() signature
+
+```js
+Stack stack.attr(
+  string name,
+  mixed value,
+  bool overwrite = false
+```
+
+If the third parameter is set to `true` it will call
+`this.attributes.set()` instead,
+thereby overwriting the value of the attribute.
+
+:::noteThis method is chainable as it returns the Stack object:::

sites/dev/docs/reference/api/stack/generatetransform/readme.mdx

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+---
+title: Stack.generateTransform()
+---
+
+The `Stack.generateTransform()` method generates SVG transforms for the stack,
+sets them as attributes, and returns the original stack.
+
+
+## Stack.generateTransform() signature
+
+```js
+Stack stack.generateTransforms(Object transforms)
+```
+
+The `Stack.generateTransforms()` method takes a single argument,
+an object with the following properties containing the transforms
+to apply:
+
+| Property | Type |Description |
+|----------|------|------------|
+| `move`   | Object | `move.x` and `move.y` are coordinates to which the stack should be translated
+| `rotate` | Number | The number of degrees to rate the stack around its center |
+| `flipX`  | Boolean | Whether to flip the stack along the X axis |
+| `flipY`  | Boolean | Whether to flip the stack along the Y axis |
+
+:::noteThis method is chainable as it returns the Stack object:::

sites/dev/docs/reference/api/stack/getanchor/readme.mdx

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+---
+title: Stack.getAnchor()
+---
+
+The `Stack.getAnchor()` method returns the Point which is the anchor
+to align parts in the stack.
+
+
+## Stack.getAnchor() signature
+
+```js
+Point stack.getAnchor()
+```

sites/dev/docs/reference/api/stack/getpartlist/readme.mdx

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+---
+title: Stack.getPartList()
+---
+
+The `Stack.getPartList()` method returns an Array containing the parts
+in this stack.
+
+## Stack.getPartList() signature
+
+```js
+Part[] stack.getPartList()
+```

sites/dev/docs/reference/api/stack/getpartnames/readme.mdx

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+---
+title: Stack.getPartNames()
+---
+
+The `Stack.getPartNames()` method returns an Array containing the names
+of the parts in the stack.
+
+## Stack.getPartNames() signature
+
+```js
+String[] stack.getPartNames()
+```

sites/dev/docs/reference/api/stack/home/readme.mdx

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+---
+title: Stack.home()
+---
+
+The `Stack.home()` method calculates the stack's bounding box,
+setting the `width`, `height`, `topLeft`, and `bottomRight` properties,
+and returns the original stack.
+
+## Stack.home() signature
+
+```js
+Stack stack.home()
+```
+:::noteThis method is chainable as it returns the Stack object:::
+
+## Notes
+
+The bounding box is calculated taking into consideration the `margin` setting.
+
+`Stack.home()` caches its calculations by checking whether the stack's
+`topLeft` property has been set.
+If `topLeft` has a truthy value, it will not re-calculate.

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

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+---
+title: Stack
+---
+
+A Stack object represents a collection of parts within a pattern.
+Stacks are used when laying out the pattern.
+
+:::note RELATED
+
+See [Stacks](/guides/designs/stacks)
+for information about how stacks are used in a pattern.
+
+:::
+
+## Signature
+
+```js
+Stack new Stack(String name)
+```
+
+The stack constructor takes a single argument, a String containing the name
+of the stack.
+
+## Properties
+
+Stack objects come with the following properties:
+
+- `attributes` : An [Attributes](/reference/api/attributes) instance holding the stack's attributes
+- `parts` : A set of parts in the stack
+- `name` : The name of the stack
+- `topleft` : A [Point](/reference/api/point) that is the top left of the stack's bounding box
+- `bottomRight` : A [Point](/reference/api/point) that is the bottom right of the stack's bounding box
+- `width` : The width of the stack in mm
+- `height` : The height of the stack in mm
+- `anchor` : A [Point](/reference/api/point) that is used as the anchor to align parts in the stack
+
+
+## Methods
+
+A Stack object exposes the following methods:
+
+<ReadMore />