Update web dependencies

- react: Update to new root rendering method
- react-router: Replace useHistory with useNavigate
- react-router: Replace <Switch> with <Routes>
- reimplement sticky notice from scratch in ModPackViewPage
- remove isomorphic-ws as it's latest version doesn't work and only
  saves one line of code.
- remove import of antd.dark.css
- fix misc css breakages.

packages/lib/package.json

@@ -16,7 +16,6 @@
     "chalk": "^4.1.2",
     "fast-deep-equal": "^3.1.3",
     "fs-extra": "^11.1.1",
-    "isomorphic-ws": "^5.0.0",
     "jimp": "^0.22.8",
     "jsonwebtoken": "^9.0.1",
     "jszip": "^3.10.1",