Fix issues with documentation generation

[rob-luke]

Investigation 👀

• There was an upstream change to how the theme handles different versions
• Dev is failing due to mne handling of scipy changes (no action here yet)

[codecov[bot]]

Codecov Report

Merging #469 (1286473) into main (63d56e0) will decrease coverage by 0.11%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #469      +/-   ##
==========================================
- Coverage   94.20%   94.08%   -0.12%     
==========================================
  Files          65       65              
  Lines        2673     2673              
  Branches      396      396              
==========================================
- Hits         2518     2515       -3     
- Misses         99      101       +2     
- Partials       56       57       +1     

Impacted Files	Coverage Δ
mne_nirs/tests/test_examples.py	80.64% <0.00%> (-6.46%)	:arrow_down:
mne_nirs/visualisation/_plot_3d_montage.py	98.03% <0.00%> (-0.99%)	:arrow_down:

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[rob-luke]

This doesn't fix the dev issues, but gets us closer to all green. So in it goes