The TTF files are not served or used for anything else than converting
them to woff and woff2 formats, so there is no need to store them in the
git repo. In case a new format comes along, we would need to fetch these
from the git history or from upstream sources.
Change-Id: Iedc9162011b3b37587a2a176949afde6878d122d
Modern browsers will use woff2, which has smaller size than woff
Updated the README in the font repository explaining how different
file formats are produced.
Bug: T128291
Change-Id: I81c5380fdbf0ff76142b67cf8fce9db20e8164fa
