Document generators for C++

[lefticus]

• https://github.com/hdoc/hdoc
• https://www.copperspice.com/documentation-doxypress.html
• https://www.doxygen.nl/index.html
• https://github.com/standardese/standardese
• https://x.com/SbastienLevy1/status/1898821134604448218
• https://obsidian.md/
• https://x.com/l33tname/status/1898638823568863282
• https://clang.llvm.org/extra/clang-doc.html
• https://devblogs.microsoft.com/cppblog/clear-functional-c-documentation-with-sphinx-breathe-doxygen-cmake/ (several mentioned this)
• https://github.com/JakubAndrysek/mkdoxy (two mentioned)
• https://x.com/pthomet/status/1898808910120665236
• https://jupyterbook.org/en/stable/intro.html#
• https://www.boost.org/doc/libs/1_87_0/doc/html/quickbook.html