Switch theme to export notebooks

[nathanshammah]

Description

Close #1619.

License

• I license this contribution under the terms of the GNU GPL, version 3 and grant Unitary Fund the right to provide additional permissions as described in section 7 of the GNU GPL, version 3.

Before opening the PR, please ensure you have completed the following where appropriate.

• I added unit tests for new code.
• I used type hints in function signatures.
• I used Google-style docstrings for functions.
• I updated the documentation where relevant.
• Added myself / the copyright holder to the AUTHORS file

[github-actions]

👈 Launch a binder notebook on branch nathanshammah/mitiq/download-docs

[codecov]

Codecov Report

Merging #1637 (570cedf) into master (971b9a4) will decrease coverage by 0.01%.
The diff coverage is n/a.

❗ Current head 570cedf differs from pull request most recent head 1b51284. Consider uploading reports for the commit 1b51284 to get more accurate results

@@            Coverage Diff             @@
##           master    #1637      +/-   ##
==========================================
- Coverage   98.32%   98.31%   -0.01%     
==========================================
  Files          68       65       -3     
  Lines        3277     3026     -251     
==========================================
- Hits         3222     2975     -247     
+ Misses         55       51       -4     

Impacted Files	Coverage Δ
mitiq/executor/executor.py	98.03% <0.00%> (-0.04%)	⬇️
mitiq/rem/rem.py	100.00% <0.00%> (ø)
mitiq/__init__.py	100.00% <0.00%> (ø)
mitiq/pec/representations/optimal.py	97.29% <0.00%> (ø)
mitiq/rem/inverse_confusion_matrix.py	100.00% <0.00%> (ø)
mitiq/typing.py
mitiq/calibration/calibrator.py
mitiq/calibration/settings.py
mitiq/calibration/__init__.py
mitiq/_typing.py	100.00% <0.00%> (ø)
... and 3 more

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[natestemen]

@nathanshammah if my memory serves correct, you had this working where the option to download was with the plain markdown file (instead of what would be ideal which is the ipynb file). If so, let's just do that for now, otherwise I fear this will be forgotten about, and I think having an md download is better than nothing!

WDYT?

[natestemen]

@nathanshammah should we close this?