Reformat apps page

Looks just a wee bit more like an app store, even if it's a static page. Put all the license/source info in a clean format. Split Apps and Games. Thought the one screenshot on the page was overbearingly large. Would like to know when apps on this page are updated. Mostly just experimenting with my ability to do this on Github, not even sure I can figure out how to suggest this merge to the main repository if I leave this page, so I'm going to push this button, and assume Github won't let me do anything I'm not allowed to do? (I totally forgot to add Duoludo's license/source info, but I'm not sure how to back up this train.)