[core] Restore development playground #701
Merged
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This restores the development playground we used to have with the pages router. Unfortunately, the app router requires a bit more setup, but the experience should now be the same—every component with a default export placed in the /docs/app/playground directory will be exposed under the /playground/[filename] path.
Git ignores the contents of the directory.
Also fixed the Google Analytics script that was failing on the not-found page.