* add french c++ course

* fix blankline linting

* Update courses/free-courses-fr.md
Co-authored-by: NDavid Ordás <3125580+davorpa@users.noreply.github.com>

* add to index
Co-authored-by: Nx0rld <git@x0rld.eu>
Co-authored-by: NDavid Ordás <3125580+davorpa@users.noreply.github.com>

* remove online course from "books"

* add french C course in the more appropriate section
Co-authored-by: Nx0rld <git@x0rld.eu>

* add french javascript course

* fix url
Co-authored-by: Nx0rld <git@x0rld.eu>

* reorganize files

1. make it easier to find files
2. reduce scrolling to get to README on main view of repo

* remove tr.txt again

* copy file from #3938

* clean up line spacing

* sort lists

* removed openclassrooms links

based on comments by @x0rld and @innocenzi

* add link from readme

* fix sorting

* normalize attribution