Add missing views/worlds/index.ejs and fix gitignore patterns

- Add views/worlds/index.ejs template file to repository
- Update .gitignore to use /worlds/ instead of worlds/ to only exclude root-level worlds directory
- This ensures application view templates are tracked while site-specific Luanti data remains ignored

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

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

.gitignore

@@ -59,7 +59,7 @@ temp/
 *.tmp
 
 # Luanti/Minetest specific files (if running locally)
-worlds/
+/worlds/
 mods/
 games/
 textures/