Doxygen: simplify logic, remove vendored header/footer/css files#738

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ManifoldFR wants to merge 3 commits intojrl-umi3218:masterfrom ManifoldFR:topic/doxygen-2025

+10-782

Commits on Jan 15, 2025

doxygen.cmake : remove DOXYGEN_USE_TEMPLATE_CSS
ManifoldFR
committed
Remove vendored Doxygen html footer, header, header-mathjax and css
ManifoldFR
committed
doxygen.cmake : add warning about setting DOXYGEN_HTML_STYLESHEET
ManifoldFR
committed