Installation would fail if you did not first cd in into the nerd-fonts
directory before running install.sh as $nerdfonts_root_dir referenced
${PWD} which is the path your shell is into when calling the script,
not the basepath of the script, parent of "patched-fonts".
It now has more options than copying all patched files or one font’s
patched font files.
In short, you can choose which patchset, which compatibility, which
method (copy or symlink), and which fonts you want to install.
