Integrate with nextcloud (and khal)

[a-t-0]

• Integrate with: github.com/TruCol/Self-host-GitLab-CI-for-GitHub (In essence add the self-signed certificate to Nextcloud)
• And verify the Nextcloud server is reachable over https locally and over tor.
• And verify the Nextcloud server is reachable over https locally and over tor in paralell with GitLab.

CLI calendar and Phone

The Nextcloud installation also sets up a CLI calendar (I believe Khal) over tor, and sets up a phone sync over tor. Update both of these procedures to use the SSL certs generated using this repo.