docs: site WIP, extractor type cleanup, tests preset; add broadcastedRef

Type the docs extractor's package.json parsing as unknown; comment the Vite
plugin version-skew cast; wire the tests preset; site/architecture WIP.

docs/content.config.ts

@@ -0,0 +1,26 @@
+import { defineCollection, defineContentConfig } from '@nuxt/content';
+
+const repositories = [
+  '../configs/tsconfig',
+  '../core/stdlib',
+  '../core/platform',
+  '../infra/renovate',
+  '../web/vue',
+];
+
+export default defineContentConfig({
+  collections: repositories.reduce((acc, repo) => {
+    const name = repo.split('/').pop();
+
+    acc[name] = defineCollection({
+      source: {
+        include: `**/*.md`,
+        exclude: ['**/node_modules/**', '**/dist/**'],
+        cwd: repo,
+      },
+      type: 'page',
+    });
+
+    return acc;
+  }, {}),
+});