Docs for `type` are missing Node and Python

[mootari]

The docs section covering the cell types does not include node and python:

notebook-kit/docs/kit.html

Lines 112 to 125 in 6c2ec69

	<script id="49" type="text/markdown">
	The `type` attribute can have one of the following values:
	- `module` - JavaScript
	- `text/x-typescript` - TypeScript
	- `text/markdown` - Markdown
	- `text/html` - HTML
	- `application/sql` - SQL
	- `application/x-tex` - ${tex`\TeX`}
	- `text/vnd.graphviz` - DOT (Graphviz)
	- `application/vnd.observable.javascript` - Observable JavaScript
	Here's an example of each supported cell type.
	</script>

notebook-kit/src/lib/serialize.ts

Lines 95 to 98 in 6c2ec69

	case "application/vnd.node.javascript":
	return "node";
	case "text/x-python":
	return "python";

[mootari]

The format attribute probably needs to be added as well?