Cleaned up 2-number comparator

Added "Try Again" and "Compare More Numbers" links.
Fixed all page elements being in H1.
Moved some code to footer.php for more consistent look
Added page title
Moved <hr> tag to footer
Changed title of Comparator 2.0 to 3-Number

Changed title of "tomcatt's Number Comparator 2.0" to "tomcatt's 3-Number Comparator"