[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 :white_check_mark:

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

Additional details and impacted files

```diff @@ 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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