[CentOS-docs] Update the "repository URL" links for centos.org website

I had a bit of trouble git cloning the website since the repository URL
portion isn't filled in, see:
https://git.centos.org/summary/?r=websites/centos.org.git

Only until I went onto
https://git.centos.org/summary/?r=websites/bugs.centos.org.git was I able
to infer on how to actually git clone it.

Could someone possibly update the URL for
https://git.centos.org/summary/?r=websites/centos.org.git ?
--
Charlie Drage
PGP - 4096R/C037D617
http://pgp.mit.edu/pks/lookup?op=get&search=0xDA227403C037D617
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