[v3] 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 93.17%. Comparing base (54e4b0d) to head (c6babb7).
Report is 2 commits behind head on next.

Additional details and impacted files

@@           Coverage Diff           @@
##             next     #132   +/-   ##
=======================================
  Coverage   93.17%   93.17%           
=======================================
  Files          73       73           
  Lines         718      718           
  Branches       55       54    -1     
=======================================
  Hits          669      669           
  Misses         49       49           

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