[v1] Optimize gifs packaged with vsce to reduce file size

[t1m0thyj]

What It Does

Shrinks the size of GIFs in the repo by lossless optimizing them with gifsicle:
for gif in $(find packages/vsce/docs/images -name '*.gif'); do gifsicle -b -O3 $gif; done

How to Test

Review Checklist
I certify that I have:

• tested my changes
• added/updated automated tests
• updated the changelog
• followed the contribution guidelines

Additional Comments

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.17%. Comparing base (3430525) to head (2b810e0).

Additional details and impacted files

@@             Coverage Diff              @@
##           zowe-v1-lts     #131   +/-   ##
============================================
  Coverage        94.17%   94.17%           
============================================
  Files               74       74           
  Lines              755      755           
  Branches            92       94    +2     
============================================
  Hits               711      711           
  Misses              44       44           

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