fix(web/starlight): add content.config.ts with explicit glob loader

Astro 5 Content Layer requires an explicit collection config. Starlight's
built-in docsLoader() resolves the base path without a './' prefix, which
Astro's glob loader doesn't handle correctly in our pnpm monorepo —
the collection ends up empty and only 404.html gets generated.

Using astro/loaders glob directly with base './src/content/docs' restores
index.html generation for both guides and api sites.

Author: bpamiri

web/sites/api/src/content.config.ts

@@ -0,0 +1,10 @@
+import { defineCollection } from 'astro:content';
+import { docsSchema } from '@astrojs/starlight/schema';
+import { glob } from 'astro/loaders';
+
+export const collections = {
+  docs: defineCollection({
+    loader: glob({ base: './src/content/docs', pattern: '**/[^_]*.{md,mdx}' }),
+    schema: docsSchema(),
+  }),
+};

web/sites/guides/src/content.config.ts

@@ -0,0 +1,10 @@
+import { defineCollection } from 'astro:content';
+import { docsSchema } from '@astrojs/starlight/schema';
+import { glob } from 'astro/loaders';
+
+export const collections = {
+  docs: defineCollection({
+    loader: glob({ base: './src/content/docs', pattern: '**/[^_]*.{md,mdx}' }),
+    schema: docsSchema(),
+  }),
+};