Improve Blockquote markup

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.

Signed-off-by: J. Hogue <j@projectevolution.com>
Merge branch 'development' of https://github.com/jhogue/typeplate.github.com into blockquote
Merge branch 'refs/heads/blockquote' into development