Use click in CLI

[assadyousuf]

This was a originally a stale PR, couldn't open it back up for some reason so put fix into a new PR

Solves this issue. Essentially makes it easier to build out the planned clai serve [--protocol] command while still allowing the CLI to defualt to the (current) clai [prompt]

[hyperlint-ai]

PR Change Summary

Updated the command-line interface (CLI) usage documentation to enhance clarity and organization.

• Revised the usage section for improved readability
• Clarified the options available for the CLI commands
• Adjusted formatting for consistency in the documentation

Modified Files

• clai/README.md

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[DouweM]

@assadyousuf Thanks Assad. As it happens, just this week we started working with the creator of rich and textual on a rewrite of clai, so we're going to hold off on changes until that lands. I'll leave this PR as a draft and we can see if it makes sense to update for the new implementation then.