example changes needed to move to python 3.8, conda-lock, myst markdown

[phaustin]

@brian-rose -- not intended for a merge, just to give you an idea of what we're doing

[codecov-io]

Codecov Report

Merging #141 (aee373e) into master (2cabb49) will not change coverage.
The diff coverage is 0.00%.

@@          Coverage Diff           @@
##           master    #141   +/-   ##
======================================
  Coverage    0.00%   0.00%           
======================================
  Files          66      66           
  Lines        3552    3557    +5     
======================================
- Misses       3552    3557    +5     

Impacted Files	Coverage Δ
climlab/model/ebm.py	0.00% <0.00%> (ø)

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[brian-rose]

@phaustin thanks for this! I guess I had effectively abandoned the courseware collection because so much of the content got absorbed into lecture notes in The Climate Laboratory. I need to make a decision about whether to remove this content or maintain it better.