Hopefully in a month or two you will be able to load it up into the games Steam Workshop for all to enjoy. Right now I guess you can only upload it onto one of the free cloud storage services and then put the link to it into a post on here and on the Steam forum.
One of the Founders on here did create a website to put maps on but I haven't seen him on here for a while. Perhaps you could send them to him to add to his database:
http://www.havagame.com/Hava/maps/
