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/utils/round/readme.mdx

@@ -0,0 +1,18 @@
+---
+title: utils.round()
+---
+
+The `utils.round()` function rounds a value to two decimals.
+
+## Signature
+
+```js
+float utils.round(float value)
+```
+
+## Example
+
+```js
+utils.round(0.1234) // 0.12
+utils.round(5.6789) // 5.68
+```