docs: Add an option search to our documentation

flake-modules/packages.nix

@@ -1,10 +1,16 @@
 {
   perSystem =
-    { pkgsUnfree, config, ... }:
+    {
+      pkgsUnfree,
+      config,
+      inputs',
+      ...
+    }:
     {
       packages = import ../docs {
         # Building the docs evaluates each plugin's default package, some of which are unfree
         pkgs = pkgsUnfree;
+        inherit (inputs') nuschtosSearch;
       };
 
       # Test that all packages build fine when running `nix flake check`.