added reference to the source code being available in footers
added reference to the source code being available in footers

pascalpoizat/pascalpoizat.github.io,freakonometrics/arthurcharpentier,pascalpoizat/pascalpoizat.github.io,freakonometrics/arthurcharpentier,freakonometrics/arthurcharpentier,pascalpoizat/pascalpoizat.github.io,freakonometrics/arthurcharpentier,pascalpoizat/pascalpoizat.github.io