Refactor README, mainly ToC updates
Refactor README, mainly ToC updates

* Major update to table of contents, remove template artifacts
* Removed note about systemd config as we also have Upstart config
* Minor link addition
* Added recommended module name H1 section

Signed-off-by: Daniel Farrell <65eaad88897e615d9128b5e890b98414aac720cc@redhat.com>

semihalf-kardach-stanislaw/puppet-opendaylight,umeshksingla/puppet-opendaylight,srisankethu/puppet-opendaylight,trozet/puppet-opendaylight,trozet/puppet-opendaylight,srisankethu/puppet-opendaylight,umeshksingla/puppet-opendaylight,semihalf-kardach-stanislaw/puppet-opendaylight