Crypto: iterate on wording, UI and UX.

Change wording of setup recovery key banner and change target to root.
Iterate on wording of encryption screen.
Change button to Switch.
Iterate on wording to delete key storage.
Iterate on wording and icon on the root setting.
Remove confirmation dialog when disabling backup.
Add subtitle to change recovery key action.
Enable key storage directly, remove quite empty screen to setup the backup.
Disable recovery action if key backup is disabled.

appnav/src/main/kotlin/io/element/android/appnav/LoggedInFlowNode.kt

@@ -260,7 +260,7 @@ class LoggedInFlowNode @AssistedInject constructor(
                     }
 
                     override fun onSetUpRecoveryClick() {
-                        backstack.push(NavTarget.SecureBackup(initialElement = SecureBackupEntryPoint.InitialTarget.SetUpRecovery))
+                        backstack.push(NavTarget.SecureBackup(initialElement = SecureBackupEntryPoint.InitialTarget.Root))
                     }
 
                     override fun onSessionConfirmRecoveryKeyClick() {