[isf-wifidog] Template mods

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I'm finally getting around to implementing my wifidog setup.

However, I have one final issue.

Since I'm using radius as the auth server, and no users will create
their own content etc, I'd like to remove all extraneous items. By
mod'ing the login template etc, I've accomplished this - at least
mostly.

However, I'd like to remove the "preferences" button and related link
from the main index page - the page that's displayed by default after
a login. (This link is on the left side, right next to the logout
botton/link.)

I've looked for it, but can't seem to find it.

I'd appreciate a quick pointer on where to look, or alternatively, if
there's a better way to "remove" it via some other method.

(And yes, I understand that the templates are not generally intended
to be modified and that future upgrades will break things and probably
require addl mods...)

TIA!
-Greg