How to renew an expired certificate?

Problem/Motivation

Without the ✨ Automated certificate expiration notifications Active implemented it could happen that a certificate expires and even if 🐛 WSOD on the admin UI if client communcation fails Fixed will be fixed, Lockr customers may not know how to unblock themselves in this situation.

Steps to reproduce

Proposed resolution

Probably multiple ideas can be implemented

1. Document how they can reset Lockr registration and reconnect...
2. Provide a UI solution for re-registering a site.
3. Provide a Drush command for re-registering a site.
4. ...?

Remaining tasks

User interface changes

API changes

Data model changes