Install scripts bash improvements
Original motivation was to let me call the util/install_macos.sh script from anywhere, which was my original intent to install the fonts.
I downloaded and extracted the zip somewhere, then from the working dir I was in, I just called ~/Downloads/monaspace-v1.101/util/install_macos.sh and it failed.
With the first commit, it can now be called from anywhere.
While I was as it, I suggested some improvements (maybe a bit opinionated?), feel free to request removal of some if it doesn't suit your practices. There are several commits to better isolate changes. Commits detailed message contain motivation/explanation when relevant if you need.
I just noticed I went a bit quickly and missed PR #218
My version follows the same logic but goes a step beyond and also handles macOS though.
Also relates to PR #239
Also related to PR #66 & issue #63
Just want to say that this is an important PR because it fixes the shebang.