Hello, Thank you for the advice, precisely I'm curious, I would be interested in replacing all his "needs" of the "3rdparty" file by what is available in the Debian repositories, is this possible? How should I go about it? I just have to name them in the debian/control file as "Build-Depends"?
Yes, everything is from the upstream tarball.
The files that lintian complains about are "uglified" _javascript_ files which we do not accept as source in Debian.
For the 3rdparty/MathJax/bin/* files, there seem to be source files in 3rdparty/MathJax/src/*. Have you tried to build that 3rdparty/MathJax/bin/* directory yourself and have you checked out if you can replace the whole whing with libjs-mathjax?