Improve notebook build script

[bwohlberg]

Improve notebook build script and update built notebooks in submodule.

[codecov]

Codecov Report

Merging #300 (5a81dd7) into main (039489b) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #300   +/-   ##
=======================================
  Coverage   94.31%   94.31%           
=======================================
  Files          53       53           
  Lines        3326     3326           
=======================================
  Hits         3137     3137           
  Misses        189      189           

Flag	Coverage Δ
unittests	94.31% <ø> (ø)

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