As for me the main page of any product is important to make a good first impression. When I open the main page of JanusGraph it looks like the site was constructed in the 90s (sorry for criticism). I understand that the style was taken from TitanDB (http://titan.thinkaurelius.com) but I think it should be changed.

Another concern is that the main page uses http protocol still. I do understand that there is nothing to secure on the main page but I believe that https protocol will make a better impression. Notice that docs.janusgraph.org is using https protocol (Letsencrypt certificate). I believe it isn't hard to add an additional SSL certificate for the main page. Also, Letsencrypt supports wildcard certificates, it is possible to make a certificate for the entire *.janusgraph.org domain to cover all subdomains and use the same certificate on the main page and in the docs.