Add documentation website (#833)

* test frontmatter rendering

* restructure files

* add docs website

* move postcss config

* revert postcss config

* update readme

* update logo

* fix internal links

docs/src/content/config.ts

@@ -0,0 +1,6 @@
+import { defineCollection } from 'astro:content';
+import { docsSchema } from '@astrojs/starlight/schema';
+
+export const collections = {
+	docs: defineCollection({ schema: docsSchema() }),
+};