3x as many threads can be displayed on main page

Right now there's only 7-10 threads displaying on the main page, to view more recent threads you have to click all threads. It literally doesn't have to be this way. Increase the number of threads showing on main page by times 3.

I am glad /test/ takes 20 threads, too bad /prog/ and /lounge/, which are prioritary, only take 10 threads.