If you are coming from our main GBA emulator page, this is a great way to link to the roms if you don't want to do much work. Assuming you just want to host from here, make sure you deploy this Repo with Github Pages. It should do this automatically, but check the Actions tab ...
and the github pages linked in question (that hosts the emulator) is forked from walsh's 'gba' repository, where the README states that the core of the emulator (the part that provides functionality) is from taisel's IodineGBA.