v3.14.0

• Feat: use react-refresh instead of react-hot-loader.
• Chore: remove EnvironmentPlugin, use __DEV__ to handle the environment in client.
• Chore: remove pnp-webpack-plugin, webpack v5 builts-in it.
• Refactor: adjust webpack config for preparing to upgrade to v5.
• Refactor: move hostname and PORT to config file.
• Refactor: simplify the setup of loadable-components.
• Upgrade: css-loader from v4 to v5 and other dependencies.