Remove redundant CSS, merge wiki-style.css into erudite.css, misc tidying, small style changes

A few style changes that I wanted to make it made sense to roll into this commit:
- Links are blue, rather than black
- Footer section is all sans-serif
- Blockquote no longer has large quote marks
- Text is no longer indented at the start of a paragraph
- Century gothic has been removed from the sans serif font list

Change-Id: I7c694328670c39edfbb0b62bcd4818bddd80a727