docs: new URL (HOLD)

[lukegalbraithrussell]

Summary

Switching from slack.dev to tools.slack.dev

Requirements

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.78%. Comparing base (b4caba0) to head (75946d7).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2253   +/-   ##
=======================================
  Coverage   87.78%   87.78%           
=======================================
  Files          19       19           
  Lines        1646     1646           
  Branches      464      464           
=======================================
  Hits         1445     1445           
  Misses        194      194           
  Partials        7        7           

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