Looks like an interesting project. I'm not entirely sure that you're prioritising the right information though - almost all of the text on your site is about Haskell / the technology stack you're using; but for a CMS, most people care about the admin UI / features and how they simplify the process of managing a website's content.

I think it'd be useful to show some screenshots / examples of how it works, in order to immediately engage potential users, and then lead on to the benefits of using Haskell etc.