docs: add catppuccin/nixos-search (#1911)

Co-authored-by: Alaina <68250402+alaidriel@users.noreply.github.com>

README.md

@@ -1055,6 +1055,7 @@ Catppuccin is available for various apps and in different formats. Here is a lis
 <details open>
 <summary>🔎 Search Engines</summary>
 
+- [NixOS Search](https://github.com/catppuccin/nixos-search)
 - [SearXNG](https://github.com/catppuccin/SearXNG)
 - [Startpage](https://github.com/catppuccin/startpage)
 - [Whoogle](https://github.com/catppuccin/whoogle)

resources/ports.yml

@@ -467,6 +467,12 @@ ports:
         platform: userstyle
         icon: twitter
         color: blue
+    nixos-search:
+        name: NixOS Search
+        category: search_engine
+        platform: userstyle
+        icon: nixos
+        color: blue
     noir:
         name: Noir
         category: browser_extension