Migration to Nextcloud 11 - Released

Nextcloud 11 sets new standard for security and scalability. We also update some apps and add the Twofactor U2F App.

The todos are sorted by priority.

Todos:

• Appstore access ignored - Done (Github link)
• Slow loading in Firefox - Done (Github link)
• Portknox auto installation needs to be updated - Done
• New customers get Nextcloud 11 installed - Done
• All customer clouds needs to be on the latest Nextcloud version (10.0.3) - Done
• Test of the migration for existing customers - Done
• Eat your own Dog-food. Update our own Clouds - Done
  
• Migration all existing customers - Done