mastodon: revert broken custom theme

hosts/mastodon/default.nix

@@ -34,24 +34,6 @@
     enable = true;
     localDomain = "c3d2.social";
 
-    package = pkgs.mastodon.overrideAttrs (oa: {
-      # install chaos.social theme for eri
-      postPatch =
-        let
-          chaos_social_custom = pkgs.fetchzip {
-            url = "https://github.com/chaossocial/custom/archive/dadb72e258e56a4773d58d242d9fd1048d9560c7.zip";
-            sha256 = "sha256-0yfor0cpPGUZbZHP7RXs5Ls6uNzcXi8Zb3AMaNqPz5s=";
-          };
-        in ''
-          for F in {custom,custom_wide,mascot,mastodon-light}.scss ; do
-            cp ${chaos_social_custom}/themes/$F app/javascript/styles/
-          done
-          echo "chaos-social-wide: styles/custom_wide.scss" >> config/themes.yml
-
-          rm -fr public/packs tmp/
-        '';
-    });
-
     smtp = {
       host = "mail.c3d2.de";
       port = 587;