I had a local version of my website built on a version of Academic that I had cloned back in the summer. Considering I now wanted it as a submodule, here is what I did:
I created a repo to which I added all my preexisting content, except the themes folder;
this answer I gave in the thread below applies here as well. The tl;dr is make sure you copy all necessary files from the exampleSite folder into the corresponding folders in the root directory of your hugo site.
Thanks, I tried to do what you said and copied everything I thought was relevant (same folders, same index.md files, and I replaced my config.toml with the one from the exampleSite and added all my information again), but now the website shows up blank.
I don’t know if it’s relevant, but this is a multilingual website, and it was working just fine before I added the theme in its latest version as a submodule.