R1:6e69523efc2f

Move "show all config" from DarkConsole to /config/

Summary:
Currently, we have a "config" panel in DarkConsole. It's useful to have a table of all effective config values, but it doesn't need to be in DarkConsole. Move it to Config instead. Basically:

- You don't need to activate DarkConsole to see it anymore;
- now visible only to admins;
- respects config mask/hide;
- somewhat prettier;
- links to config edit;
- no longer ships down on every DarkConsole request with a giant table of rarely…