Adjusted settings blurb to use markdown and make settings page easier to read

Travis, 

Your DevTips series on YouTube is absolute Gold. Well done. I don't know if this will help or not, but I tried to make the blurb yaml entry on the settings.yml a little more legible. 

I accomplished that by adjusting the settings.yml blurb to use markdown and make settings page easier to read. Also, added the markdownify filter to properly render markdown on the about section include.

I hope this helps!

Sincerely, 
Brian Z.