Update docs to include link to langium docs and playground

[lee-treehouse]

📑 Summary

Add a link to langium parser info and playground to help contributors

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commit: d38210b

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 3.58%. Comparing base (4d5ede8) to head (d38210b).

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #7402   +/-   ##
=======================================
  Coverage     3.58%   3.58%           
=======================================
  Files          475     475           
  Lines        47589   47589           
  Branches       741     741           
=======================================
  Hits          1706    1706           
  Misses       45883   45883           

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Build	Status	Details	Updated (UTC)
default (Inspect)	✅ No changes detected	-	Feb 17, 2026, 3:52 AM