Add-ons for the game can be downloaded from the Discord server, in the Dragon Repo channel. As of this writing, there is only one add-on that has been uploaded.
The bad news: I have no other options available right now when it comes to hosting mod content.
The good news: There seriously isn't much mod content available that works in the current version anyway, and modding will probably be dropped later on since I have other plans that will make them obsolete.