In doxygen the setting `HTML_COLORSTYLE` has been introduced with as default `AUTO_LIGHT` but due to the current strategy of CGAL in respect to HTML stylesheets the divider between the treeview and the text is not properly visible anymore. Due to the same strategy the setting to `AUTO_LIGHT` does not make sense for CGAL.
When setting `HTML_COLORSTYLE=LIGHT` the divider is properly visible again.
Based on the problems with the line numbers in some warnings, see review of https://github.com/CGAL/cgal/pull/6688 one of the problems was the `ALIASES` for figures, here we have the code `\latexonly ^^ \endlatexonly` though the code in the `\latexonly` part should be LaTeX commands. Here the "attempted" newline is not necessary at all so the `^^` can be removed leaving an empty `\latexonly` part that can be removed as well.
There are a number of other numbering problems found in https://github.com/CGAL/cgal/pull/6688 but they are on the doxygen side as a proposed pull request https://github.com/doxygen/doxygen/pull/9465 has been submitted.
Update of documentation in respect of code fragments
- making code fragments work in footnotes
- placing some words in in code tags
- completing some words to code tags
- removing some `#` as they are not necessary
- don't show obfuscation code in email