refactor: new dev/prod containers

- Use a single Dockerfile for all Zeppelin services
- Add a Dockerfile in project root that can be used by
  app hosting services
- Provide a standalone and lightweight prod setup
  - Standalone is the same as the old setup, with mysql+nginx
  - Lightweight only runs bot+backend+dash, no mysql/nginx
- Remove mounted mysql data folders for dev and prod
  - This resolves permission issues caused by the mount
  - The mysql service uses a regular named volume now
- Simplify .env options and clearly separate different prod setups
- Remove update.sh
  - Different setups require different update procedures, so a common
    update.sh no longer works

dashboard/webpack.config.js

@@ -175,7 +175,7 @@ if (process.env.NODE_ENV === "production") {
     devServer: {
       ...(process.env.DEV_HOST ? { host: process.env.DEV_HOST } : undefined),
       historyApiFallback: true,
-      port: 1234,
+      port: 3002,
     },
   });
 }