Release v0.2.0

• Some font sizes have been increased for better readability
• The nixos-rebuild command call was simplified in build mode
• The hostname will now be sanitized in case the user adds unsupported characters
• There now is a new --debug CLI argument to use the application with a different
  settings directory and in build mode by default
• The window size and position will now be remembered and restored on next start
• There now is a Build Host setting in the settings dialog to set the
  hostname to build the configuration on