chore: add articles/webroot/ to .gitignore

Build output from review-webmaker should not be tracked in git.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: piti6

.gitignore

@@ -8,5 +8,6 @@ articles/*.html
 # articles/*.md
 articles/*.xml
 articles/*.txt
+articles/webroot/
 
 .DS_Store