feat: convert to an astro application (!9)

Reviewed-on: https://codeberg.org/nhcarrigan/docs/pulls/9
Co-authored-by: Naomi Carrigan <commits@nhcarrigan.com>
Co-committed-by: Naomi Carrigan <commits@nhcarrigan.com>

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() }),
+};