Add new screenshots to Manager UI page

[Ekhorn]

Since the Vaadin migration things look different, make screenshots of the new UI changes, see relevant page https://docs.openremote.io/docs/user-guide/manager-ui/#map

Have a look at the following directories as well:

1. https://github.com/openremote/documentation/tree/main/docs/developer-guide/img
2. https://github.com/openremote/documentation/tree/main/docs/user-guide/img
3. https://github.com/openremote/documentation/tree/main/docs/tutorials/img
4. https://github.com/openremote/documentation/tree/main/static/img
5. https://github.com/openremote/documentation/tree/main/docs/img