Remove hydra jobset

It is not active any more and was just added to play around with it.

flake.nix

@@ -45,18 +45,5 @@
         };
 
       defaultPackage = packages.seminararbeit;
-
-      # My hydra only has x86_64-linux builders
-      hydraJobs =
-        if pkgs.lib.elem system [ "x86_64-linux" ]
-        then {
-          build = packages.seminararbeit;
-          hydra-product = pkgs.runCommandNoCC "seminararbeit-hydra" { } ''
-            install -D ${packages.seminararbeit} $out/seminararbeit.pdf
-            mkdir -p $out/nix-support
-            echo "doc-pdf seminararbeit $out/seminararbeit.pdf" >> $out/nix-support/hydra-build-products
-          '';
-        }
-        else { };
     });
 }