docs: remove links to pages that are no longer referenced in markdown

[zimeg]

Testing tests of a pull_request_target on this fork before suggesting an upstream change-

slack-github-action/.github/workflows/test.yml

Line 77 in 5b3b010

event_url: ${{ steps.push.outputs.url || steps.pull_request.outputs.url }}

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.86%. Comparing base (82b86fb) to head (fa50cdb).

Additional details and impacted files

@@           Coverage Diff           @@
##             main       #2   +/-   ##
=======================================
  Coverage   99.86%   99.86%           
=======================================
  Files           7        7           
  Lines         722      722           
=======================================
  Hits          721      721           
  Misses          1        1           

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[zimeg]

5b3b010 is main at this moment!

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