machines/magenta: use gitea from nixpkgs

machines/magenta/services/gitea.nix

@@ -5,17 +5,6 @@ let
 
   giteaCfg = config.services.gitea;
 
-  gitea = pkgs.gitea.overrideAttrs (oldAttrs: {
-    postInstall = with pkgs; ''
-      mkdir $data
-      cp -R ./go/src/${oldAttrs.goPackagePath}/{public,templates,options} $data
-      mkdir -p $out
-      cp -R ./go/src/${oldAttrs.goPackagePath}/options/locale $out/locale
-      wrapProgram $out/bin/gitea \
-        --prefix PATH : ${lib.makeBinPath [ bash git gzip openssh gnupg ]}
-    '';
-  });
-
   robotsTxt = pkgs.writeText "robots.txt" ''
     User-agent: *
     Disallow: /
@@ -26,7 +15,6 @@ in
 
   services.gitea = {
     enable = true;
-    package = gitea;
     httpPort = 9901;
     domain = hostname;
     rootUrl = "https://${hostname}";