remove maxcdn

closes #129
remove one remaining nazgul.dxnet.ru occurrence

followup of #120
Merge pull request #130 from Mailaender/mirror-maintenance-june-2014

Mirror maintenance June 2014
replace red cross with life belt icon

closes #125
Merge pull request #128 from Mailaender/lifebelt

Replaced the red cross with life belt icon
mention the Arch Linux repositories
harden against read_nonblock errors
mention Gentoo portage and overlays
mention the OBS packages
mention PlayDeb Ubuntu packages
now in MarkDown and directly link it
Merge pull request #132 from Mailaender/official-repos

Added links on where else to find OpenRA repositories
Allow playtest download button to be disabled.
Remove duplication from social link definitions.
Remove duplication from page title definitions.
Overhaul download page generation.

- Remove remaining ties to the res0l server.
- Use GH API instead of raw http.
- Remove unnecessary duplication.
News post for release-20140608.