WiP: Convert Ansible taskfiles to roles

[KellerFuchs]

Taskfiles:

• [x] cron (renamed to systemd-cron.d)
• [x] dns (renamed to unbound)
• [x] docker
• [ ] hashbang
• [ ] ldap-nss
• [x] logging (renamed to systemd-journald)
• [ ] mail
• [ ] misc
• [ ] nginx
• [x] packages (renamed to apt)
• [ ] profile
• [ ] security
• [ ] tor

Closes #70 (once complete)