Website Broken after installing Really Simple SSL

hello!

earlier today i installed the Really Simple SSL wordpress plugin on my website and added a security certificate. unfortunately this broke my website and the theme files and content are no longer working as they were before. I followed all the instructions during the setup process, the plugin said i would be able to revert the site back to http but it is still not working as it was before.

does anyone know what i can do to resolve this issue?

The page I need help with: [log in to see the link]