Limit the number of news posts on the font page

More than 3 overflows the little box they're supposed to be in.

Change-Id: I302181680840fc09717a45ee3bcba341bd05110d
Remove underline on visited links

In at least Opera, the old way causes visited links to permanently be
underlined.

Change-Id: I41f9a5e04483b158dcaf0c8130a99a279237feb3
Reduce splash screen font size

This bigger font size causes some elements to overflow the box they're
supposed to stay in (the "AFS is a distributed..." text, in
particular).

Change-Id: Ib310c338675b444914d74b670e424124f4456f3a
Moved newsletters to _posts

Imported the newsletters as jekyll posts, instead of static pages, with
the category of 'newsletter'.  The jekyll permalink metadata is used to
generate the same urls as the old site.  The files were renamed to the
jekyll mandated year-mon-day-title format for posts.  The newsletter
index is automatically generated now, and the extra newsletter.yml file
is not needed, so was deleted.