sphinx: remove version from HTML title

Signed-off-by: Nicolas Iooss <nicolas.iooss_git@polytechnique.org>
Add etc-server/dhcp/ folder with ISC DHCP server and dnsmasq configs

Signed-off-by: Nicolas Iooss <nicolas.iooss_git@polytechnique.org>
rst: highlight syntax of config files

Signed-off-by: Nicolas Iooss <nicolas.iooss_git@polytechnique.org>
etc/resolv.conf: add OpenDNS resolvers

Signed-off-by: Nicolas Iooss <nicolas.iooss_git@polytechnique.org>