Add documentation and fix pnpm start command

- Add README.md with tech stack, project structure, and dev setup
- Add TODO_ACCESS.md with Lighthouse audit results and priority fixes
- Add start script to root package.json
- Add start task to turbo.json

turbo.json

@@ -13,6 +13,10 @@
     "dev": {
       "cache": false,
       "persistent": true
+    },
+    "start": {
+      "cache": false,
+      "persistent": true
     }
   }
 }