Remove blockquote

I spoke with Matt in the design team and he was confused as to why a blockquote was overriding the skytextregular font-family with Helvetica, especially when this Helvetica is not available on all platforms as standard.

I wish to use the blockquote element and have to override the current blockquote style, which feels unnecessary.
Merge pull request #227 from rowlando/patch-2

Remove blockquote