Add cache busting to search.js to resolve browser caching issues

- Add timestamp-based version parameter to search.js URL
- Forces browsers to fetch the updated ElasticLunr-based search implementation
- Resolves "Failed to load search index: JSON.parse" error caused by cached old version
- Uses Zola's now() function with date formatting for automatic cache invalidation

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: Rust-Trends

templates/base.html

@@ -29,7 +29,7 @@
 
     {# Include search functionality #}
     {% if config.build_search_index %}
-        <script src="{{ get_url(path='search.js') }}"></script>
+        <script src="{{ get_url(path='search.js') }}?v={{ now() | date(format='%Y%m%d%H%M') }}"></script>
     {% endif %}
 </body>