Add dark mode

[josephfrazier]

See https://reportedcab.slack.com/archives/C9VNM3DL4/p1692087071429079:

Have we ever considered supporting dark mode? Sometimes I’m filing complaints late at night and I wish

I'm curious, do you know if your browser automatically indicates a
preference for dark mode at night? I'm asking because the webapp uses a
pretty simple css framework, and I've found a similar one that will
automatically use dark mode if preferred by the browser, so I'm hoping I
could just drop that in and not have to add in other code to support
switching between the two

Yeah I’m pretty sure Safari on iOS just auto switches if it’s available!

---

Commits at PR open:

• yarn add simpledotcss

• XXX DOES NOT WORK: Home.js: Use simpledotcss instead of marx-css

  I get this error when I open localhost:3000

  SyntaxError

  /Users/josephfrazier/workspace/reported-web/node_modules/simpledotcss/simple.css:2
  :root,
  ^
  
  SyntaxError: Unexpected token ':'
      at Object.compileFunction (node:vm:360:18)
      at wrapSafe (node:internal/modules/cjs/loader:1088:15)
      at Module._compile (node:internal/modules/cjs/loader:1123:27)
      at Module._extensions..js (node:internal/modules/cjs/loader:1213:10)
      at Object.newLoader [as .js] (/Users/josephfrazier/workspace/reported-web/node_modules/pirates/lib/index.js:104:7)
      at Module.load (node:internal/modules/cjs/loader:1037:32)
      at Function.Module._load (node:internal/modules/cjs/loader:878:12)
      at Module.require (node:internal/modules/cjs/loader:1061:19)
      at require (node:internal/modules/cjs/helpers:103:18)
      at Object.simpledotcss (/Users/josephfrazier/workspace/reported-web/external commonjs "simpledotcss":1:1)