Account deletion is too well hidden

### Actual behaviour
Deleting the account is too hidden.

### Expected behaviour
Most users we have tested this with, do not find out how to delete the account. Have the account deletion not that well hidden. Maybe not in the three dots menu at the top of the user page, but on the user page itself. Or even earlier than that in one of the menus.

### Steps to reproduce
1. Click on the menu in the top left.
2. Click on the user name.
3. Click on "Manage accounts"
4. Click on the account name.
5. Click on the three dots in the menu on the top right.
6. Click on "Delete account"

### Environment data
Android version:
7.0

Device model:
Moto G5 Plus

Stock or customized system:
Customized version, but only colors and icons/logos have been altered.

Nextcloud app version:
2.0.5