Docs: update community section with videos and workshops

[sliedig]

What were you searching in the docs?

Community video and workshops for learning Powertools

Is this related to an existing documentation section?

https://docs.powertools.aws.dev/lambda/dotnet/we_made_this/

How can we improve?

Add community videos and workshops

Got a suggestion in mind?

No response

Acknowledgment

• I understand the final update might be different from my proposed suggestion, or refused.

[hjgraca]

#536 closed