Added dark mode switch

Launch the UI in dark mode with the --dark-mode switch

modules/ui.py

@@ -1783,6 +1783,8 @@ for filename in sorted(os.listdir(jsdir)):
     with open(os.path.join(jsdir, filename), "r", encoding="utf8") as jsfile:
         javascript += f"\n<script>{jsfile.read()}</script>"
 
+if cmd_opts.dark_mode:
+    javascript += "\n<script>go_dark_mode();</script>\n"
 
 if 'gradio_routes_templates_response' not in globals():
     def template_response(*args, **kwargs):