Themes:  Modified the '.✈dialogcontainer h3' slightly as a fix for an issue with the X11 application (which I'm actively working on again).
core/server.py:  Changed some the early logic inside of main() to try to detect/handle the situation where the `log_file_prefix` base directory does not exist.
core/configuration.py:  Added a new '--configure' option that tells Gate One to configure its settings (first-run situation) and create SSL keys/certs before quitting.  It will not start up any Gate One processes.  The purpose being to make it easier to run Gate One inside a Docker container.
core/server.py:  Added support for the new '--configure' option (it just calls sys.exit() after everything is done being written).