Add references to published articles about the events

[MathewBiddle]

What can be improved? What is missing?

Where is the OBIS article from 2023?

What about the article from 2022?

Let's add those to the landing page to provide support for why someone might want to attend one of these.

[MathewBiddle]

https://obis.org/2024/06/28/biodiv-mob-workshop-2024/

edit: found 2024

[sformel-usgs]

2023: https://obis.org/2023/05/11/mbdm-workshop/
2022: https://obis.org/2022/04/12/biodatamob/