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/store-methods/log.error/readme.mdx

@@ -0,0 +1,37 @@
+---
+title: log.error()
+---
+
+This is the logging method for logs of `error` level.
+
+
+:::note
+Logging something at the `error` level will stop FreeSewing from completing the draft of the pattern.
+:::
+
+## Signature
+
+```js
+undefined Store.log.error(...data)
+```
+
+Like all logging methods, this method is _variadic_.
+It will add logs to the array at `store.logs.error`.
+
+## Example
+
+```js
+({ log, part }) => {
+  log.error('Hey, I am logging')
+  log.error(
+    'I am logging too',
+    "But you don't see me make a big deal out if it"
+  )
+   
+  return part
+}
+```
+
+## Notes
+
+You can override the default logging methods in the store with a plugin.