Get rid of post voting format in the Help and Support category

No “big green checkmark” appears in the list of topics, just a tiny tick in a box at the left of the title. The topic names (and the tick) are nearly illegible in the list as they’re light grey on a white background.

What we need is either a replacement for OSQA, or we tell people who want answers to questions that we’re not interested in helping and they should go and ask on https://gis.stackexchange.com/questions/ instead. If they want a cozy chat (or a discussion worthy of :popcorn: ), then obviously they should stick around here.