Improve the website with some info about next community meeting

This could be one way to give more visibility to our public meetings.
For example, an idea could be to add a dynamic banner such as the one in the Cilium.io page:

<img width="1021" height="423" alt="Image" src="https://github.com/user-attachments/assets/8326b977-e0f8-470b-beac-659989528539" />