* Introduce Kumpir, our new www server, add wordpress role
* move kumpir to services group, use safer distinction for ssl_cert location, reduce www playbook
* set server type to services
* fix typo
* rename service-wordpress to service-nginx-wordpress
* Add service-nginx-etherpad role
* Add ed25519 keypair for system_users when supported.
* Revert "Add ed25519 keypair for system_users when supported."
This reverts commit ffef991ca41185d19953b96439e80b1b9a6ba534.
* Change generated keys format to ed25519
* fix indention of nginx templates, reduce amount of needed tasks by adding extra_opts to unarchive, remove not needed mysql db tasks, make new acme_server default
* Change new default preference for acme servers, marking acme_server zuckerwatte deprecated soon.
