Update supervisor methods, update comments, convert to fig

Supervisor:
-now has more standardized config settings in application .ini files
regarding socket locations, autostart settings and others.
-also explicitely starts groups, not individual programs
-entrypoint.sh scripts are the standard method of starting apps now
because by default, we need to handle env var passing, signal passing,
and start/restart behavior gracefully

Fig
-Radial officially uses fig now for demonstration and templating.
Changed this template accordingly.