cleanup obsolete img/js/css
add assets precompile cap task
fix cap restart task: needs RACK_ENV, not RAILS_ENV
ignore tags locally

added because ag ignores the global git ignored files
apply slideshow only to applicable pages
fix chrome slideshow tab header too small

initially, chrome didn't properly extend the span with the content '1/xx'.
on the next iteration of the slideshow, the span expanded.

this fixes it from the start