Manage our own CDN

[philippjfr]

unpkg proved slow and unreliable and jsdelivr, while better, is still not great. So we now have our own CDN hosted on S3 and sped up by CloudFront: https://cdn.holoviz.org

[codecov]

Codecov Report

Merging #3867 (f5307df) into master (0278e47) will increase coverage by 0.01%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master    #3867      +/-   ##
==========================================
+ Coverage   82.89%   82.91%   +0.01%     
==========================================
  Files         224      224              
  Lines       32789    32813      +24     
==========================================
+ Hits        27181    27206      +25     
+ Misses       5608     5607       -1     

Flag	Coverage Δ
ui-tests	34.67% <20.51%> (+0.30%)	⬆️
unitexamples-tests	75.09% <66.66%> (-0.04%)	⬇️

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

Impacted Files	Coverage Δ
panel/compiler.py	6.14% <7.69%> (-0.32%)	⬇️
panel/io/resources.py	87.59% <94.73%> (+0.23%)	⬆️
panel/config.py	60.27% <100.00%> (ø)
panel/io/convert.py	30.43% <100.00%> (-0.55%)	⬇️
panel/tests/io/test_save.py	100.00% <100.00%> (ø)
panel/io/reload.py	69.56% <0.00%> (-2.18%)	⬇️
panel/io/cache.py	81.98% <0.00%> (-0.46%)	⬇️
panel/io/server.py	74.65% <0.00%> (-0.20%)	⬇️
panel/util.py	87.08% <0.00%> (+0.73%)	⬆️
panel/tests/conftest.py	88.20% <0.00%> (+1.31%)	⬆️
... and 1 more

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