Missing DirectoryIndex in offline documentation
We need a DirectoryIndex pointing to start.html in offline documentation, to avoid these logs:
==> /var/log/apache2/error.log <==
[Wed Nov 23 10:45:24.275554 2016] [autoindex:error] [pid 16706:tid 139839328462592] [client 10.20.30.81:53560] AH01276: Cannot serve directory /usr/share/doc/lemonldap-ng-doc/pages/documentation/current/: No matching DirectoryIndex (index.html,index.cgi,index.pl,index.php,index.xhtml,index.htm) found, and server-generated directory index forbidden by Options directive