@a3d Okay, my fork should work now.
You'll need to install manually, it's been months since I've heard from Sam, so idk when the PR will be added.
npm install git+https://github.com/yariplus/nodebb-theme-persona.git#creepr
If you just want to add subcategories to your own theme, the needed changes are in my last commit.
Tip: You can also change the font easily under the Custom CSS section in ACP.
font-family: "Lato", sans-serif !important;