chore: Enable Format On Save in VS Code

[samestep]

Description

Previously I left this setting out of our penrose.code-workspace file because I was guessing that different people have different preferences about this, but now I think it's more likely that some people simply didn't know this setting exists.

Checklist

• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new ESLint warnings
• I have reviewed any generated changes to the diagrams/ folder

[codecov]

Codecov Report

Merging #978 (119e33f) into main (2842be8) will not change coverage.
The diff coverage is n/a.

❗ Current head 119e33f differs from pull request most recent head 93a8e0b. Consider uploading reports for the commit 93a8e0b to get more accurate results

@@           Coverage Diff           @@
##             main     #978   +/-   ##
=======================================
  Coverage   63.39%   63.39%           
=======================================
  Files          62       62           
  Lines        7867     7867           
  Branches     1818     1818           
=======================================
  Hits         4987     4987           
  Misses       2762     2762           
  Partials      118      118           

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[jiriminarcik]

As someone who "simply didn't know this setting exists", I approve these changes.

[cloudflare-pages]

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Latest commit:	93a8e0b
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