data/fonts: cleanup

* make font derivations fixed-output where applicable
 * fix dead links
 * `stdenv.lib` -> `lib` where `stdenv` is not involved
 * remove `meta.platforms = [ unix ]` and `meta.platforms = [ linux ]` because the restriction has no sense for data packages

pkgs/data/fonts/aurulent-sans/default.nix

@@ -1,12 +1,13 @@
-{stdenv, fetchzip}:
+{ lib, fetchFromGitHub }:
 
-fetchzip rec {
+fetchFromGitHub rec {
   name = "aurulent-sans-0.1";
-
-  url = "https://github.com/deepfire/hartke-aurulent-sans/archive/${name}.zip";
+  owner = "deepfire";
+  repo = "hartke-aurulent-sans";
+  rev = name;
   postFetch = ''
     mkdir -p $out/share/fonts
-    unzip -j $downloadedFile \*.otf -d $out/share/fonts/opentype
+    tar xf $downloadedFile -C $out/share/fonts --strip=1
   '';
   sha256 = "1l60psfv9x0x9qx9vp1qnhmck7a7kks385m5ycrd3d91irz1j5li";
 
@@ -14,8 +15,8 @@ fetchzip rec {
     description = "Aurulent Sans";
     longDescription = "Aurulent Sans is a humanist sans serif intended to be used as an interface font.";
     homepage = http://delubrum.org/;
-    maintainers = with stdenv.lib.maintainers; [ deepfire ];
-    license = stdenv.lib.licenses.ofl;
-    platforms = stdenv.lib.platforms.all;
+    maintainers = with lib.maintainers; [ deepfire ];
+    license = lib.licenses.ofl;
+    platforms = lib.platforms.all;
   };
 }