Add content to the right sidebar
Add content to the right sidebar

The right sidebar will contain a call info view and a tab view to which
different sections can be added as needed.

Signed-off-by: Daniel Calviño Sánchez <bd7629e975cc0e00ea7cda4ab6a120f2ee42ac1b@gmail.com>

nextcloud/spreed,nextcloud/spreed,nextcloud/spreed