Enhance the Gallery

[philippjfr]

• Add featured gallery examples
• Add thumbnails to index page
• Start migrating some gallery examples into how-to section
• Support theming in base template
• Basic support for pydata-sphinx-theme theming

[codecov]

Codecov Report

Merging #4598 (5c60c54) into main (af3fda9) will increase coverage by 9.87%.
The diff coverage is 90.90%.

@@            Coverage Diff             @@
##             main    #4598      +/-   ##
==========================================
+ Coverage   73.85%   83.73%   +9.87%     
==========================================
  Files         260      260              
  Lines       37115    37116       +1     
==========================================
+ Hits        27413    31078    +3665     
+ Misses       9702     6038    -3664     

Flag	Coverage Δ
ui-tests	39.58% <18.18%> (?)
unitexamples-tests	73.87% <90.90%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
panel/theme/fast.py	98.43% <ø> (ø)
panel/io/markdown.py	90.16% <50.00%> (-0.32%)	⬇️
panel/io/server.py	75.45% <100.00%> (+0.13%)	⬆️
panel/tests/io/test_markdown.py	100.00% <100.00%> (ø)
panel/viewable.py	67.81% <100.00%> (ø)

... and 42 files with indirect coverage changes

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[MarcSkovMadsen]

The Gallery examples are all a bit dashboardy. Would it be an ide to include something Streaming, with an advanced Tabulator table or ML use case?

[philippjfr]

Working on it. This is primarily porting existing examples.