v2v: add design figures

Signed-off-by: May <sirhuntthepure@users.noreply.github.com>
admin/logical-networks: add design figures

Signed-off-by: May <sirhuntthepure@users.noreply.github.com>
admin/users-and-roles: add design figures

Signed-off-by: May <sirhuntthepure@users.noreply.github.com>