chore: Use Prettier in VS Code

[samestep]

This PR sets the VS Code formatter to Prettier for all the languages to which it seems to apply:

penrose/package.json

Lines 22 to 23 in d99c216

	"format": "prettier 'packages/**/*.{ts,tsx,js,scss,css,json,md}' --write",
	"format:check": "prettier 'packages/**/*.{ts,tsx,js,scss,css,json,md}' --check",

[cloudflare-pages]

Deploying with    Cloudflare Pages

Latest commit:	6608b95
Status:	✅  Deploy successful!
Preview URL:	https://ae78db23.penrose-panes.pages.dev

View logs

[codecov]

Codecov Report

Merging #750 (6608b95) into main (d99c216) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #750   +/-   ##
=======================================
  Coverage   65.50%   65.50%           
=======================================
  Files          46       46           
  Lines        7900     7900           
  Branches     1502     1502           
=======================================
  Hits         5175     5175           
  Misses       2716     2716           
  Partials        9        9           

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