feat(search): enable offline search with Lunr.js

- Enable offlineSearch = true for client-side search functionality
- Disable Google Custom Search to avoid external API dependency
- Provides instant search across all documentation content
- Works completely offline without server requirements

hugo.toml

@@ -112,10 +112,10 @@ url_latest_version = "https://example.com"
 github_branch= "main"
 
 # Google Custom Search Engine ID. Remove or comment out to disable search.
-gcs_engine_id = "d72aa9b2712488cc3"
+# gcs_engine_id = "d72aa9b2712488cc3"
 
 # Enable Lunr.js offline search
-offlineSearch = false
+offlineSearch = true
 
 # Enable syntax highlighting and copy buttons on code blocks with Prism
 prism_syntax_highlighting = false