Reduce the amount of items in the account menu

The devices entry gone (not even Element has this) and so is the logout
action. The Switch account menu item is moved to the bottom so its
easier to access by mouse. The "Open Secret Backup" is moved under
Security settings where it lives next to the other crypto-related
settings.

src/settings/NeoChatSecurityPage.qml

@@ -85,6 +85,19 @@ FormCard.FormCardPage {
         title: i18nc("@title:group", "Encryption")
     }
     FormCard.FormCard {
+        FormCard.FormButtonDelegate {
+            id: secretBackupDelegate
+            text: i18nc("@action:inmenu", "Manage Secret Backup")
+            description: i18nc("@info", "Import or unlock encryption keys from other devices.")
+            icon.name: "unlock"
+            onClicked: root.QQC2.ApplicationWindow.window.pageStack.pushDialogLayer(Qt.createComponent('org.kde.neochat', 'UnlockSSSSDialog'), {}, {
+                title: i18nc("@title:window", "Manage Secret Backup")
+            })
+        }
+        FormCard.FormDelegateSeparator {
+            above: secretBackupDelegate
+            below: importKeysDelegate
+        }
         FormCard.FormButtonDelegate {
             id: importKeysDelegate
             text: i18nc("@action:button", "Import Keys")