3.13 Include expected and beneficial files

Include standard website metadata and configuration files to support discoverability, transparency, and operational best practices.

Expected files:
Include favicon.ico, robots.txt, opensearch.xml, site.webmanifest, and sitemap.xml by default. Include additional default files if they become standard.
Beneficial files:
Include additional standard files, such as ads.txt, carbon.txt, humans.txt, and security.txt. Include additional default files if they become standard.