Add howto to add applet tray and a few common applets to the bar.

[kgilmer]

Some users prefer applets for some configuration over gnome-control-center. This task is to write a howto block on the site that describes how to do this with Regolith. Related to #2.

[kgilmer]

Fixed: https://regolith-linux.org/howto.html#i3-tray

[shijiantian]

Simply change the value of tray_output can't make applet work.
I finally find the solution in here:i3-gnome/i3-gnome#25
exec --no-startup-id dbus-launch nm-applet can work.

[kgilmer]

I'll add some details to the documentation on that point, thanks @shijiantian

[nrktkt]

@kgilmer is this still supported? the doc link is dead and I can't find anything about applets in the new docs.

[kgilmer]

Hi @kag0 , enabling the tray in the i3bar is supported in Regolith. This will do it:

echo "i3-wm.bar.trayoutput:	primary" >> ~/.config/regolith/Xresources

Reload your i3 session, and then to test from the commandline:

$ dbus-launch nm-applet