docs(image): update overview for image module

[matthewmayer]

minor fix to clarify image category methods are removed

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.96%. Comparing base (34cf364) to head (a8b9b4c).
Report is 1 commits behind head on next.

Additional details and impacted files

@@           Coverage Diff           @@
##             next    #3177   +/-   ##
=======================================
  Coverage   99.96%   99.96%           
=======================================
  Files        2798     2798           
  Lines      227806   227806           
  Branches      576      579    +3     
=======================================
+ Hits       227732   227736    +4     
+ Misses         74       70    -4     

Files with missing lines	Coverage Δ
src/modules/image/index.ts	100.00% <ø> (ø)

... and 2 files with indirect coverage changes