Refactor repo for consistency

[lucifercr07]

Fix below changes as part of playground-web repo:

• In README add details for node version requirement and other pre-requisite to run the project.
• In README add steps to run prettier scripts in case of Github workflow failure.
• Rename Dockerfile_Backend file to PlaygroundMonoDockerfile, also update the yml files for it.
• Rename CLI package to Shell
• Remove comment // comment this to hide footer from page.tsx file
• Update comments everywhere to // comment from //comment.
• Fix “Cleanup in :” and “Command left:” inconsistent styling. Also, it should be Commands left. Add a tool tip (i) button, next to both that tells what these limits are all about.
• Delete mockData.json file
• In api.ts, propagate the error to the user instead of just logging it to console. Show user the error that was emitted from the backend/mono.
• Instead of calling “blacklist” var names update the word to “blocklist”.

[RishabhC-137]

@lucifercr07 I will take it

[lucifercr07]

@RishabhC-137 assigned, thanks for contributing.

[lucifercr07]

Closing, merged as part of: #59