Blockquote markup improvements

Went through index.html and changed all the block quotes to the new preferred markup. Changed the block quote example as well. Added a bit more detail to the description for the element. Adjusted some styles, but minimally.

The styles will need to be reviewed. I tried for a bit to get them closer to the original, but now I see that you have many style changes in development so it would be best if you reviewed how this new markup effects your styles. 

Signed-off-by: J. Hogue <j@projectevolution.com>