Change nextcloud server URL instead of create new account

**Is your feature request related to a problem? Please describe.**
Yes, I have changed the url of my server and I want to change it instead of remove and recreate the account.

**Describe the solution you'd like**
Add the possibility to simply change the server url into app Profile section

**Describe alternatives you've considered**
The only alternative is remove e recreate account

**Additional context**
nothing