Move puzzle app to a Playground package

[bgrgicak]

What is this PR doing?

It moves the Playground puzzle app into a Playground package.

What problem is it solving?

It enables us to deploy the puzzle app to the Playground server.

How is the problem addressed?

By creating a new Playground package and updating the code to work with Vite.

Testing Instructions

• Follow the readme instructions to start a dev server
• Setup the puzzle API using these instructions
• Update this line to point to your development API
• Open the app and click on Build your site
• Write one of the action keys like multisite on a piece of paper (text should be clear and bold)
• Scan it
• Confirm that an action was added
• Click on Take me to my site
• Confirm that the site load and the actions were applied

Note let's address design feedback and improvements in separate PRs to unblock sponsors from updating their blueprints

[adamziel]

Unit tests failures are intermittent, but the build failure seems legitimate:

Could not resolve "../node_modules/@wordpress/components/build-style/style.css" from "packages/playground/puzzle/src/index.tsx"

[bgrgicak]

Unit tests failures are intermittent, but the build failure seems legitimate:

Yes, I fixed it now. For some reason, I don't get these errors when I run the commands locally so it may take one or two more attempts.