Make documentation tabs more visual

[pfebrer]

It was very difficult to understand where the content of the tabs ended.

By adding some custom CSS, we have made it more intuitive.

Previous layout:

Current layout:

[pfebrer]

Also added the sphinxcontrib.jquery dependency to requirements.txt

[codecov]

Codecov Report

Merging #566 (8264989) into main (445ac83) will decrease coverage by 0.01%.
The diff coverage is n/a.

❗ Current head 8264989 differs from pull request most recent head 5b7ad81. Consider uploading reports for the commit 5b7ad81 to get more accurate results

@@            Coverage Diff             @@
##             main     #566      +/-   ##
==========================================
- Coverage   87.36%   87.36%   -0.01%     
==========================================
  Files         374      374              
  Lines       47174    47174              
==========================================
- Hits        41213    41212       -1     
- Misses       5961     5962       +1     

Impacted Files	Coverage Δ
src/sisl/__init__.py	97.56% <ø> (ø)
src/sisl/__main__.py	0.00% <ø> (ø)
src/sisl/_array.py	100.00% <ø> (ø)
src/sisl/_category.py	80.91% <ø> (ø)
src/sisl/_collection.py	100.00% <ø> (ø)
src/sisl/_common.py	100.00% <ø> (ø)
src/sisl/_dispatcher.py	68.33% <ø> (ø)
src/sisl/_environ.py	82.75% <ø> (ø)
src/sisl/_help.py	69.82% <ø> (ø)
src/sisl/_internal.py	35.48% <ø> (ø)
... and 219 more

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[zerothi]

It is live!