Doxygen manual examples missing

[gdolle]

The documentation section for the manual examples seems missing in the API.
The *.doc files in "feelpp/doc/manual/" for most example are not displayed at http://doc.feelpp.org/
It seems there is a problem with doxygen configuration.

[vhuber]

doc.feelpp.org is intended for the library developers: the manual documentation has to be moved to the feelpp-book.

[prudhomm]

yes but @gdolle is right, some documentation disappeared, namely the one from example files with doxygen keywords in them.
we should recobver them or rewrite them

[gdolle]

As mentionned @prudhomm, there was an "example" section in doxygen that is not in the feelpp-book and was generated thanks to code comments parsing. Also it parse specific *.doc files. For example I see there's still doc/manual/heat/heatsink.doc.

Currently there is no more documentation available for feel++ examples online (either in the API nor in the feelpp-book) and I think that is a serious problem.

If everyone agree to put these docs in the feel++ book, I'd be glad to rename the issue.

[github-actions]

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