Inside the folder ./ttf-monda-1.0/fonts
are the files necessary for "installing" the font to the system; the rest are for the purpose of putting them on github. These files are to be hosted externally in a tarball.
An example is to host the "source files" on github and have the Github system generate a tarball when you release a tagged version. Alternatively, anything from Google Drive to Mega.nz can serve the .tar.gz
file, but you'll have to generate it yourself with
$ tar zcvf * project-1.0.tar.gz
Add this tarball URL to the PKGBUILD
when modifying/updating other information.
For every new release (different tarball), modify the checksum to the PKGBUILD
$ makepkg -g >> PKGBUILD
Voila.