Move ansible-sshjail and zsh-histdb into my config instead of living as separate flakes.

nix/configuration/roles/zsh/default.nix

@@ -109,6 +109,12 @@ in
             ];
           };
         };
+
+        nixpkgs.overlays = [
+          (final: prev: {
+            zsh-histdb = (final.callPackage ./package/zsh-histdb/package.nix { });
+          })
+        ];
       }
     ]
   );