Guest accounts should not have a trashbin logo visible

[patrickjahns]

As discussed in #31 - for now guest users should not have a trashbin.

Expected Behavior

• Bottom left trashbin icon should not be visible
• Trashbin page should not be reachable, as guests don't have a trashbin

Actual Behavior

• Bottom trashbin icon visible
• Guest accounts can enter their "trashbin" (page) - even if they are not able to use it

[PVince81]

Might need a CSS hack as core isn't extensible in a way that would allow apps to hide trashbin