Ignore node_modules and package-lock.json

These are local build tooling artifacts from installing hugo-extended via
npm to render and audit the site; they should not be tracked.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QWdScrWP32GB7vZBjx87Jd

Author: claude

.gitignore

@@ -1,5 +1,9 @@
 public/
 .hugo_build.lock
 
+# Node / build tooling
+node_modules/
+package-lock.json
+
 # Local Netlify folder
 .netlify