Support maxima language

[mwouts]

Fixes #927

[codecov]

Codecov Report

Merging #942 (32eaa43) into main (3ad96e2) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #942      +/-   ##
==========================================
- Coverage   99.10%   99.10%   -0.01%     
==========================================
  Files         117      117              
  Lines       10869    10867       -2     
==========================================
- Hits        10772    10770       -2     
  Misses         97       97              

Impacted Files	Coverage Δ
jupytext/header.py	98.78% <ø> (-0.03%)	⬇️
jupytext/jupytext.py	98.40% <ø> (ø)
jupytext/languages.py	100.00% <ø> (ø)
jupytext/formats.py	98.45% <100.00%> (+<0.01%)	⬆️
tests/test_cli_config.py	100.00% <100.00%> (ø)
tests/test_contentsmanager.py	100.00% <100.00%> (ø)
tests/test_header.py	100.00% <100.00%> (ø)
tests/test_jupytext_nbconvert_round_trip.py	100.00% <100.00%> (ø)

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