gh-36470: refresh macaulay2 interface a little bit
    
- changing the official link to macaulay2.com
- gather some optional annotations
- a few pep8 details fixed

### 📝 Checklist

- [x] The title is concise, informative, and self-explanatory.
- [x] The description explains in detail what this PR is about.
    
URL: #36470
Reported by: Frédéric Chapoton
Reviewer(s): Dima Pasechnik

Author: Release Manager