feat: add migration guide for transitioning documentation to classroomio.com/docs with Vercel rewrites and updated configurations

DOCS_MIGRATION.md

@@ -0,0 +1,137 @@
+# Migrating Docs from docs.classroomio.com to classroomio.com/docs
+
+## Summary
+
+This guide documents the configuration to serve the docs at `classroomio.com/docs` instead of `docs.classroomio.com` using Vercel rewrites with TanStack Start.
+
+## Changes Made
+
+### 1. Docs App Configuration (`apps/docs`)
+
+**a) Updated `apps/docs/vite.config.ts`:**
+```typescript
+export default defineConfig({
+  server: {
+    port: 3000
+  },
+  base: '/docs',  // ← Added: Vite base path for asset resolution
+  plugins: [
+    mdx(await import('./source.config')),
+    tailwindcss(),
+    tsConfigPaths({
+      projects: ['./tsconfig.json']
+    }),
+    tanstackStart(),
+    react(),
+    nitro({
+      baseURL: '/docs'  // ← Added: Nitro base URL for server routing
+    })
+  ]
+});
+```
+
+**b) Updated `apps/docs/src/router.tsx`:**
+```typescript
+export function getRouter() {
+  return createTanStackRouter({
+    basepath: '/docs',  // ← Added: TanStack Router base path
+    defaultNotFoundComponent: NotFound,
+    defaultPreload: 'intent',
+    routeTree,
+    scrollRestoration: true
+  });
+}
+```
+
+These three configurations work together:
+- `base: '/docs'` - Tells Vite to prefix all asset paths with `/docs`
+- `baseURL: '/docs'` - Tells Nitro to handle all routes under `/docs`
+- `basepath: '/docs'` - Tells TanStack Router that routes are under `/docs`
+
+### 2. Main Site Configuration (`apps/classroomio-com`)
+
+**Created `apps/classroomio-com/vercel.json`**:
+```json
+{
+  "rewrites": [
+    {
+      "source": "/docs/",
+      "destination": "https://ciodocs.vercel.app/docs/"
+    },
+    {
+      "source": "/docs/:path*",
+      "destination": "https://ciodocs.vercel.app/docs/:path*"
+    }
+  ]
+}
+```
+
+This proxies all `/docs/*` requests from `classroomio.com` to your docs deployment.
+
+### 3. Cleanup
+
+- Removed empty `apps/classroomio-com/src/routes/(redirects)/docs/` folder that would conflict with the Vercel rewrite
+
+## How It Works
+
+1. **User visits:** `classroomio.com/docs/home`
+2. **Vercel receives:** Request for `/docs/home`
+3. **Vercel rewrites to:** `ciodocs.vercel.app/docs/home`
+4. **Docs app serves:** The page from its `/docs/home` route (configured with `basepath: '/docs'`)
+5. **User sees:** Content at `classroomio.com/docs/home` (URL unchanged)
+
+The key is that **both the rewrite and the docs app preserve the `/docs` path**, keeping everything aligned.
+
+## Deployment Steps
+
+### Step 1: Deploy/Redeploy the Docs App
+
+The docs app needs to be built and deployed with the `basepath: '/docs'` configuration:
+
+1. Make sure changes to `apps/docs/src/router.tsx` are committed
+2. Deploy or redeploy to `ciodocs.vercel.app`
+3. Vercel will automatically detect and deploy the changes
+
+**Vercel Project Settings for Docs:**
+- **Root Directory:** `apps/docs`
+- **Build Command:** `pnpm build`
+- **Output Directory:** `.output`
+- **Domain:** `ciodocs.vercel.app`
+
+### Step 2: Deploy/Redeploy the Main Site
+
+The main site needs the `vercel.json` rewrite configuration:
+
+1. Make sure `apps/classroomio-com/vercel.json` is committed
+2. Deploy or redeploy to `classroomio.com`
+
+**Vercel Project Settings for Main Site:**
+- **Root Directory:** `apps/classroomio-com`
+- **Build Command:** `pnpm build`
+- **Output Directory:** `.svelte-kit`
+- **Domain:** `classroomio.com`
+
+### Step 3: Test
+
+Once both are deployed:
+
+1. ✅ Visit `classroomio.com/docs` - should show docs homepage
+2. ✅ Visit `classroomio.com/docs/quickstart/signup` - should show specific doc pages
+3. ✅ Check that styles and JavaScript load correctly
+4. ✅ Test navigation within docs
+
+## Architecture
+
+```
+User Request: classroomio.com/docs/quickstart/signup
+       ↓
+Vercel (classroomio.com) - reads vercel.json
+       ↓
+Rewrite to: ciodocs.vercel.app/docs/quickstart/signup
+       ↓
+Docs App (TanStack Start with basepath: '/docs')
+       ↓
+Serves: /quickstart/signup route
+       ↓
+User sees content at: classroomio.com/docs/quickstart/signup
+```

apps/docs/vite.config.ts

@@ -22,7 +22,7 @@ export default defineConfig({
     // see https://tanstack.com/start/latest/docs/framework/react/guide/hosting for hosting config
     // we configured nitro by default
     nitro({
-      // baseURL: '/docs'
+      baseURL: '/docs'
     })
   ]
 });