Document the removal of read-only persistence
The following documentation refer to read-only persistence, that we removed in 3.0:
- first_steps/persistence/configure.mdwn
- first_steps/persistence/upgrade.mdwn
- first_steps/persistence/use.mdwn
- first_steps/shutdown.mdwn
Related issues
- Related to #12093 (closed)
Original created by @alant on 12361 (Redmine)