Templates are stored in the database and imported from a theme XML file (and you can export your theme XML file from the ACP). For example, the MyBB default theme has this
XML file. So when we change templates in the default theme, we modify the bit of the file that has the relevant template and update the version number of the template so it gets updated upon upgrading.
Templates are actually stored within your database however you will be able to export your XML and host it on github.
Thank you all for the info!
Will have to explore the XML and what it contains.
Good that I haven't yet added plugins or themes, as such would make very difficult for the staff to find the actual modifications I made
@WallBB: Your Focus Theme looks very nice, judging from the screenshots. Will clone my MyBB when I finished my threaded view project and try out the theme the next days