junicode: 1.002 -> 1.003

Development of the font has moved from Sourceforge to GitHub, mostly
in preparation for the 2.0 version, but the 1.003 release is also
tagged there, hence the homepage change.

Release notes are here:
https://github.com/psb1558/Junicode-font/releases/tag/v1.003
and they are profoundly uninformative.

pkgs/data/fonts/junicode/default.nix

@@ -1,22 +1,26 @@
-{ lib, fetchzip }:
+{ lib, fetchFromGitHub }:
 
 let
   pname = "junicode";
-  version = "1.002";
-in fetchzip {
+  version = "1.003";
+in
+fetchFromGitHub {
   name = "${pname}-${version}";
 
-  url = "mirror://sourceforge/junicode/junicode/junicode-${version}/junicode-${version}.zip";
+  owner = "psb1558";
+  repo = "Junicode-font";
+  rev = "55d816d91a5e19795d9b66edec478379ee2b9ddb";
 
   postFetch = ''
-    mkdir -p $out/share/fonts
-    unzip -j $downloadedFile \*.ttf -d $out/share/fonts/junicode-ttf
+    local out_ttf=$out/share/fonts/junicode-ttf
+    mkdir -p $out_ttf
+    tar -f $downloadedFile -C $out_ttf --wildcards -x '*.ttf' --strip=2
   '';
 
-  sha256 = "1n170gw41lr0zr5958z5cgpg6i1aa7kj7iq9s6gdh1cqq7hhgd08";
+  sha256 = "1v334gljmidh58kmrarz5pf348b0ac7vh25f1xs3gyvn78khh5nw";
 
   meta = {
-    homepage = "http://junicode.sourceforge.net/";
+    homepage = "https://github.com/psb1558/Junicode-font";
     description = "A Unicode font for medievalists";
     maintainers = with lib.maintainers; [ ivan-timokhin ];
     license = lib.licenses.ofl;