accomodating for fern package name change to 'shed'

modules/home/environment/shed/default.nix

@@ -0,0 +1,10 @@
+{ ... }:
+
+{
+  imports = [
+    ./env.nix
+    ./aliases.nix
+    ./extraconfig.nix
+    ./options.nix
+  ];
+}