Revert "update gitignore to ignore development guide"

[lodewiges]

Reverts #634
I made a mistake; it needs to be in version control for Mistral to use it

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.92%. Comparing base (1ed3b00) to head (ed97976).
⚠️ Report is 1 commits behind head on staging.

Additional details and impacted files

@@           Coverage Diff            @@
##           staging     #635   +/-   ##
========================================
  Coverage    99.92%   99.92%           
========================================
  Files          200      200           
  Lines         2700     2700           
========================================
  Hits          2698     2698           
  Misses           2        2           

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