How to get a home page at '/' and then have all updates listed below it?

I'm pretty close to what I want at https://rapidresponsechoir.org, but the index.md file with:

---
Link: /
---

# Rapid Response Choir

seems to stuck at a date in February and I'd like the most recent posts to be listed underneath. I'm using the Magazine template.

Also, how do I get consistent top banner photo across all pages?

Thanks! - PeterB