Bug#789377: www.debian.org: update browsers section in content negotiation page (cn.wml)

On Sat, Mar 26, 2016 at 4:55 AM, Holger Wansing wrote:

> If noone objects, I will commit it shortly.

Galeon should be removed, it is dead for a long time.

There appears to be some missing space after the Voyager and IBrowse sections.

I would suggest putting the W3C link at the very top since it covers
modern browsers in common use.

I noticed the W3C page links back to Debian because we show obscure
and older browsers, so maybe we shouldn't remove those?

The page needs a much bigger overhaul IMO but I guess this is a good start.