docs: move the reference site to astro starlight (#2527)

fluxer_docs/src/content.config.ts

@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+import {defineCollection} from 'astro:content';
+import {docsLoader} from '@astrojs/starlight/loaders';
+import {docsSchema} from '@astrojs/starlight/schema';
+
+export const collections = {
+	docs: defineCollection({
+		loader: docsLoader(),
+		schema: docsSchema(),
+	}),
+};