add substituter config for ndg

flake.nix

@@ -4,6 +4,11 @@
     ndg.url = "github:feel-co/ndg";
   };
 
+  nixConfig = {
+    substituters = [ "https://feel-co.cachix.org" ];
+    trusted-public-keys = [ "feel-co.cachix.org-1:nwEFNnwZvtl4KKSH5LDg+/+K7bV0vcs6faMHAJ6xx0w=" ];
+  };
+
   # cheerfully lifted from nixos + hjem-rum doc gen
   outputs =
     inputs:
@@ -122,7 +127,7 @@
               ''
                 ndg --verbose html --jobs $NIX_BUILD_CORES --title "${projectName}" \
                   --module-options "${json}" \
-                  --generate-search true \
+                  --generate-search \
                   --output-dir "$out"
               '';
         };