Replace CRA with vite

[lihebi]

CRA has many problems:

1. It is deprecated: even no longer recommended by the React team
2. Webpack is complex to deal with. E.g., we had to use "react-app-rewired" walkaround to make Monaco editor in CRA's webpack bundler.

Vite is simple and nice. One bonus: Vite has a much better Hot Module Replacement (HMR), the hot-reloading experience is now much better (previously was pretty much unusable).

Some changes from vanilla Vite scaffolding:

1. listen on --host; listen on port 3000, set HMR WS forwarding in nginx.conf
2. fix App.css styling issues
3. set "experimentalDecorators": true, in tsconfig, and set { tsDecorators: true } in vite.config to allow Remirror's decorators.

[senwang86]

• Seems like Canvas shrinked in Chrome and Safari

• It applies Mac's default theme setting.