Remove the userdemo section in examples#25881

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Sigma-Verma wants to merge 6 commits intomatplotlib:mainfrom

Sigma-Verma:#25800

Commits on Apr 19, 2023

Update Replace usage of WenQuanYi Zen Hei by Noto Sans CJK #25724
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Commits on Apr 20, 2023

Commits on May 11, 2023

Remove userdemo section and convert examples to figures #25800
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