Merge pull request #7605 from QwikDev/no-builder

chore(docs): remove sdk-qwik use and copy 404 page

Author: wmertens

packages/docs/package.json

@@ -12,7 +12,6 @@
     "@builder.io/qwik-city": "workspace:^",
     "@builder.io/qwik-labs": "workspace:^",
     "@builder.io/qwik-react": "workspace:^",
-    "@builder.io/sdk-qwik": "0.14.31",
     "@emotion/react": "11.13.0",
     "@emotion/styled": "11.13.0",
     "@modular-forms/qwik": "0.23.1",