[Doc] Add dleyna-renderer documentation

Signed-off-by: Regis Merlino <regis.merlino@intel.com>
[Readme] Fix a typo

Signed-off-by: Regis Merlino <regis.merlino@intel.com>
[Host Service] Fix push urls

Signed-off-by: Regis Merlino <regis.merlino@intel.com>