update of information on how to install Jekyll-Scholar
update of information on how to install Jekyll-Scholar

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