parse-sass.sh no relative path

Created by: R0b1ns

This file isn't optimized for relative path. So you have to be in the Mojave-gtk-theme directory when you execute the install.sh

-> ./Mojave-gtk-theme/install.sh is not possible

On install.sh Line 398 has to be fixed as follows:

./parse-sass.sh

to

${REPO_DIR}/parse-sass.sh

But then you have continuous errors in parse-sass.sh