Enable `invenio-banners` in the header
Recently, the header template in Invenio-App-RDM was enhanced by support for the Invenio-Banners module here and here.
AFAIK this module stores banner configuration in the database and provides an administration UI for managing the banner configurations. As such, we could probably remove our custom info and warning banners and simply use Invenio-Banners. This would remove the necessity of redeployment every time we change the banner messages.