Document the "announcement banner" feature

OpenCloud 7.4.0 ships with a new announcement banner feature which can be used to notify users, e.g about upcoming maintenance windows, which needs to be documented:

<img width="1157" height="1062" alt="Image" src="https://github.com/user-attachments/assets/03b93a3a-2618-49a4-8a31-b30e1b661cdd" />

<img width="2555" height="1002" alt="Image" src="https://github.com/user-attachments/assets/28277d2a-1b9f-4e43-a248-80b9c87bdcb6" />

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Document the "announcement banner" feature #1086

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Document the "announcement banner" feature #1086

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