Clean up notebooks build script

[bwohlberg]

Improve Python notebook build script, including removal of the need to exec a bash script. Remove makefile and bash script.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.48%. Comparing base (76854da) to head (f7abee9).
Report is 716 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #108   +/-   ##
=======================================
  Coverage   90.48%   90.48%           
=======================================
  Files          42       42           
  Lines        3028     3028           
=======================================
  Hits         2740     2740           
  Misses        288      288           

Flag	Coverage Δ
unittests	90.48% <ø> (ø)

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[Michael-T-McCann]

I'm happy to see the makefile go, and I was able to use the new mechanism to build the examples on toro.