Removed old public/photos

Signed-off-by: Mark Somerville <mark@crocodile.is>
Add collections viewing section

The code involved is a direct copy of the code to display the list of
tags. The duplication feels totally wrong, but I'm experimenting with
leaving duplication in place until I encounter a third situation, to
better help me understand the abstraction.

Tested-by: Mark Somerville <mark@crocodile.is> [Arch, MRI 2.1.4, Chromium 38]
Signed-off-by: Mark Somerville <mark@crocodile.is>