Made first set of updates and enhancements for 22.04 script
Made first set of updates and enhancements for 22.04 script

- Added better intro text when running script.
- Added check to ensure it's ran with root/sudo privileges.
- Updated command to get the current IP due to aliases messing up old
  command.
- Updated domain entry text to also mention IP.
- Updated installed packages to use 22.04 ubuntu packages.
- Enhanced bookstack folder/file permission defaults to use the current
  script-running user as the primary owner. Also applied stronger .env
  permissions and ignored permissions in git changes.
- Added addition comments to script

Tested on Ubuntu 22.04 server beta VM.

BookStackApp/devops,BookStackApp/devops