* feat: implement UI for logging out
* feat: use old style dialogs for logout confirmation
* feat: implement manage sessions
* feat: implement session logout success dialog
* feat: use snjs alert for revoking sessions confirmation
* fix: make OtherSessionsLogout easier to read
- remove all Angular code related to `account-menu`
- rename React component to AccountMenu so that many parts of old code remain unchanged
- code cleanup