Primo
Su DigitalOcean, dovrei scegliere l’app: Discourse | DigitalOcean Marketplace 1-Click App
Oppure dovrei scegliere un Ubuntu 18.04 standard e poi installarlo utilizzando discourse/docs/INSTALL-cloud.md at main · discourse/discourse · GitHub
Secondo
Il modo migliore per spostare i contenuti è fare un backup e poi importarlo? Utilizzando
/admin/backups
Using discourse/docs/INSTALL-cloud.md at main · discourse/discourse · GitHub would be the way to go because that is the only officially supported method for now 
Yes, see Create, download, and restore a backup of your Discourse database for more details.
btw: when moving to digtitalocean I will change domain to a subdomain
studmed.dk —> forum.studmed.dk
anything I should be aware of? Except the dns record 
found this: Change the domain name or rename my Discourse?