Fix unterminated <span> tag in Category list
Escape amphersands in social media links
Remove target="_blank" in social media links

Some of these were accidentally put in the wrong tags, and they didn't
work because browsers ignore target="_blank" nowadays anyway
Fix incorrect positioning of the alt tag for the Google+ sharing link
Compress disqus script

This was compressed in the first place, I'm not entirely sure why I ever
expanded it.
Add missing alt tag for StumbleUpon link
Add alt text to wayland input stack diagram
Fix the size of the diagram for the Wayland input stack
Make Wayland input stack diagram float on the right