Docs: guide quick start app creation using the slack cli.

[technically-tracy]

Summary

Docs: guide quick start app creation using the slack CLI following the Bolt for JS structure authored by @zimeg.

Testing

Category

• [ ] slack_bolt.App and/or its core components
• [ ] slack_bolt.async_app.AsyncApp and/or its core components
• [ ] Adapters in slack_bolt.adapter
• [x] Document pages under /docs
• [ ] Others

Requirements

Please read the Contributing guidelines and Code of Conduct before creating this issue or pull request. By submitting, you are agreeing to those rules.

• [x] I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• [x] I've read and agree to the Code of Conduct.
• [ ] I've run ./scripts/install_all_and_run_tests.sh after making the changes.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 90.96%. Comparing base (d3ca055) to head (4b6177a). Report is 1 commits behind head on main.

:white_check_mark: All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1317   +/-   ##
=======================================
  Coverage   90.96%   90.96%           
=======================================
  Files         222      222           
  Lines        7501     7501           
=======================================
  Hits         6823     6823           
  Misses        678      678           

:umbrella: View full report in Codecov by Sentry.
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[zimeg]

👀 I'm noticing tests are failing for some reason also, but perhaps unrelated! Going to investigate this soon 🫡