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/renderascss/readme.mdx

@@ -0,0 +1,27 @@
+---
+title: Attributes.renderAsCss()
+---
+
+The `Attributes.renderAsCss()` method will render attributes as a string
+suitable for inclusion in a CSS definition.
+
+## Signature
+
+```js
+string attributes.renderAsCss()
+```
+
+## Example
+
+```js
+const attr = new Attributes()
+  .add('stroke', 'red')
+  .add('stroke-width', 2)
+  .add('stroke-dasharray', '3 1')
+
+const css = `
+path {
+  ${attr.renderAsCss()}
+}
+`
+```