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1. Deleted the plugin files using FTP.
2. Deleted all database entries.
3. Created a new admin user thanks to (https://wpengine.com/support/add-admin-user-phpmyadmin/)
4. Logged in using new credentials and got my website and my life back.
5. Vowed never to touch this plugin again.

And it has also demoted my admin user, so that I cannot access admin pages.

Go to your page and edit in Colibri.
Select the menu in the view (right). On customiser (left) it’ll tell you the item is linked to XX other pages/items. Select unlink. It’ll unlink just the page you’re editing.

After unlinking you can select another menu or no menu at all.