Stop referring to google group

Instead, we want
- for command-line stuff: Community support forum https://support.sequenceserver.com or github.com/wurmlab/sequenceserver
- for within web app, likely - https://sequenceserver.com/support/


<img width="1097" alt="Image" src="https://github.com/user-attachments/assets/55bd7b1e-4a12-4ef0-a753-b944da671763" />