Nix package creation: install a not yet supported font

The Nix packages collection is large with over 60 000 packages. However, chances are that sometimes the package you need is not available. You must integrate it yourself.

I needed for some fonts which were not already present inside nixpkgs. In Nix, a font is distributed as a package like any other software. One of the fonts to install is Dancing Script. At the time of…