Re-add sidebar filtering

In a previous commit, I had accidentally removed the `filterable` CSS
class that allowed for module filtering  in the sidebar. This commit
re-adds that feature.
Remove sorting from pull-requests-per-repo chart

Prior to this commit, the pull-requests-per-repo graph was sorted from
most to least pull requests. Unfortunately, the implementation of
sorting caused the graph to display wildly innacurate data (e.g.:
negative numbers of pull requests for some repositories) whenever the
user applied cross filtering. I was unable to find another way to
implement this that did not cause other problems. The best method I
found made the bars 2px wide.

Therefore, this commit removes sorting altogether. However, the 2px-bar
method is left commented out should anyone find a solution to that
problem.
Remove console debugging code