Make bug report template fMRIPost-specific

[tsalo]

Closes #71.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 30.59%. Comparing base (cf32223) to head (9f7d79d).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #92   +/-   ##
=======================================
  Coverage   30.59%   30.59%           
=======================================
  Files          26       26           
  Lines        2363     2363           
  Branches      286      286           
=======================================
  Hits          723      723           
  Misses       1617     1617           
  Partials       23       23           

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