Change fonts and cleanup CSS

This should have been several separate commits but Ali is still
learning and making mistakes. So here's a massive commit to change
the fonts sitewide and to clean up the CSS by moving general
selectors to the top, removing comments, and moving page-specific
styling to internal stylesheets of each page.
Change size of framed cat

Made Mr. Peppers a bit smaller.
Add top margin to cat and change h1

Added top margin to Mr. Peppers and changed 'Blog' h1 to 'Welcome to the VegPhilly Blog!'
Merge pull request #166 from ah2455/topic/misc_updates

Topic/misc updates