message: docs: migrate list of IRC bridges from wiki
diff: - [Room Commands](./room_commands.md)
  - [Room Configuration](./room_configuration.md)
  - [IRC Modes](./irc_modes.md)
  +- [Bridged Networks](./bridged_networks.md)
  - [Setup](./bridge_setup.md)
  - [Administrators Guide](./administrators_guide.md)
  - [IRC Operators](./irc_operators.md)
  