docs: Add discord server link

[aklinker1]

#587

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.48%. Comparing base (ca9b961) to head (db7e2f2).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #593   +/-   ##
=======================================
  Coverage   86.48%   86.48%           
=======================================
  Files         112      112           
  Lines        8990     8990           
  Branches      896      895    -1     
=======================================
  Hits         7775     7775           
  Misses       1201     1201           
  Partials       14       14           

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