website/de: Remove duplicate pages
WARN 2021/06/06 12:35:26 Duplicate target paths:
/workspace/doc/website/public/de/community/index.html (2),
/workspace/doc/website/public/de/platforms/ia64/index.html (2)
These indexes are stored in:
website/content/de/community/_index.adoc
website/content/de/platforms/ia64/_index.adoc