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/store/extend/readme.mdx

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+---
+title: Store.extend()
+---
+
+The `Store.extend()` method can be used to extend the store with new
+functionality by passing an array of methods and the path to the location in
+the store where they should be attached. It is typically not used directly, but
+rather through a plugin.
+
+## Signature
+
+```js
+Store Store.extend(Array methods=[])
+```
+
+:::tipThis method is chainable as it returns the `Store` object:::
+
+The single argument should be an Array of methods to add to the
+store. Each entry in the array should be an array itself holding a path in
+dot notation and a method, as such:
+
+The expected first parameter for the method is the `Store` instance.
+
+```js
+function myCustomMethod(store, ...otherArguments) {
+ // Do something clever
+}
+
+const store = new Store([
+  ["path.to.the.method", myCustomMethod ]
+])
+```  
+
+With the configuration above, you can call `store.path.to.the.method()` and it
+will run `myCustomMethod()`.
+
+Stores the value of `value` in the store under key `key`.
+
+## Notes
+
+The Store will not allow you to extend any of the following keys:
+
+- `set`
+- `setIfUnset`
+- `push`
+- `unset`
+- `get`
+- `extend`
+
+

sites/dev/docs/reference/api/store/get/readme.mdx

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+---
+title: Store.get()
+---
+
+The `Store.get()` method retrieves the data available under `key`.
+
+## Signature
+
+```js
+mixed store.get(mixed key, mixed dflt)
+```
+
+If `key` is not available, the Store will return the optional second parameter
+(a default value).
+
+## Example
+
+```js
+const store = new Store()
+store.set('example', 'Hi there')
+const value = store.get('example')
+// value now holds 'Hi there'
+```
+
+## Notes
+
+You can get/set nested keys either through dot-notation, or by passing an
+array:
+
+```js
+const store = new Store()
+
+store.set('my.nested.example', 'Hi there')
+store.set(['my', 'other', 'nested', 'example'], 'Oh hi again')
+
+let value
+// Dot notation
+value = store.get('my.nested.example') // works
+value = store.get('my.other.nested.example') // works
+// Using an array
+value = store.get(['my', 'nested', 'example']) // works
+value = store.get(['my', 'other', 'nested', 'example']) // works
+// Direct access to the store object
+value = store.my.nested.example // Also works
+value = store.my.other.nested.example // Also works
+```

sites/dev/docs/reference/api/store/logs/readme.mdx

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+---
+title: Store.logs
+---
+
+A **Store** is initialized with a `logs` property that holds logging data.
+
+:::note
+If errors are logged, FreeSewing will not try to layout the pattern.
+:::
+
+## Signature
+
+```js
+logs: {
+  debug: [],
+  info: [],
+  warning: [],
+  errors: []
+}
+```
+
+## Notes
+
+Users can override the default logging, so don't assume this is where logs end up.
+
+That's why, you should always use the [Store.log methods](/reference/store-methods#store-methods-we-maintain) to log.
+

sites/dev/docs/reference/api/store/push/readme.mdx

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+---
+title: Store.push()
+---
+
+The `Store.push()` method adds the parameters you pass it to the array stored under `key`.
+
+If `key` does not hold and Array, the Store will log a warning, but nothing will happen.
+
+## Signature
+
+```js
+Store store.push(mixed value1, mixed value2, ...)
+```
+
+:::noteThis method is [variadic](https://en.wikipedia.org/wiki/Variadic_function):::
+
+:::tipThis method is chainable as it returns the `Store` object:::
+
+## Example
+
+```js
+const store = new Store()
+store.set('example', ['Hi there'])
+store.push(
+ 'How are you doing',
+ 'How are YOU doing'
+)
+```
+

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

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+---
+title: Store
+---
+
+A **Store** object holds a simple key/value store with methods for storing and
+retrieving data. It is shared across the pattern, and is the recommended way
+to pass data between your parts.
+
+## Methods and Properties
+
+A Store object exposes the following methods and properties:
+
+<ReadMore recurse />
+
+## Extended store methods
+
+The store can also be extended with additional methods by plugins.
+
+- Refer to [the Store Methods documentation](/reference/store-methods)
+for more information and a list of store methods maintained by FreeSewing.
+- Refer to [the Plugin guide](/guides/plugins) for information about how
+plugins can be used to provide store methods.

sites/dev/docs/reference/api/store/set/readme.mdx

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+---
+title: Store.set()
+---
+
+The `Store.set()` method stores the value of `value` in the store under key
+`key`.
+
+## Signature
+
+```js
+Store store.set(mixed key, mixed value)
+```
+
+:::tipThis method is chainable as it returns the `Store` object:::
+
+## Example
+
+```js
+const store = new Store()
+store.set('example', 'Hi there')
+```
+
+## Notes
+
+You can get/set nested keys either through dot-notation, or by passing an
+array:
+
+```js
+const store = new Store()
+
+store.set('my.nested.example', 'Hi there')
+store.set(['my', 'other', 'nested', 'example'], 'Oh hi again')
+
+let value
+// Dot notation
+value = store.get('my.nested.example') // works
+value = store.get('my.other.nested.example') // works
+// Using an array
+value = store.get(['my', 'nested', 'example']) // works
+value = store.get(['my', 'other', 'nested', 'example']) // works
+// Direct access to the store object
+value = store.my.nested.example // Also works
+value = store.my.other.nested.example // Also works
+```
+

sites/dev/docs/reference/api/store/setifunset/readme.mdx

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+---
+title: Store.setIfUnset()
+---
+
+The `Store.set()` method stores the value of `value` in the store under key
+`key`, but only if that key does not already hold a value.
+
+## Signature
+
+```js
+Store store.set(mixed key, mixed value)
+```
+
+:::tipThis method is chainable as it returns the `Store` object:::
+
+## Example
+
+```js
+const store = new Store()
+store.set('example', 'Hi there')
+store.setIfUnset('example', 'Hi again') // This has no effect
+```
+

sites/dev/docs/reference/api/store/unset/readme.mdx

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+---
+title: Store.unset()
+---
+
+The `Store.unset()` value removes a `key` from the store.
+
+## Signature
+
+```js
+Store store.unset(string key)
+```
+
+:::tipThis method is chainable as it returns the `Store` object:::
+
+## Example
+
+```js
+const store = new Store()
+  .set('example', 'I will be gone before you know it')
+  .unset('example')
+```