Fix kernel issue

[tpike3]

• updates jupyter meta data to python3
• ensures ipykernel in docs dependencies
• ensure upstream is python kernel

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.30%. Comparing base (ce501b6) to head (7cc65fe).
Report is 60 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #229      +/-   ##
==========================================
+ Coverage   78.21%   78.30%   +0.08%     
==========================================
  Files          10        9       -1     
  Lines         693      765      +72     
  Branches      151      173      +22     
==========================================
+ Hits          542      599      +57     
- Misses        127      131       +4     
- Partials       24       35      +11     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[EwoutH]

Yes Readthedocs is green!

(I always only approve on PRs, I will leave the merge to you or boyu, so you can merge the way you want)

[tpike3]

OK, after some trial and error I got the tutorial so it looks more visually appealing and gets rid of a lot of the noise. Ready to merge.