genetics: Add a link to genetics.js source on GitHub
genetics: Add a link to genetics.js source on GitHub

ChrisCummins/chriscummins.github.io,ChrisCummins/chriscummins.cc,ChrisCummins/chriscummins.github.io,ChrisCummins/chriscummins.github.io,ChrisCummins/chriscummins.github.io,ChrisCummins/chriscummins.cc,ChrisCummins/chriscummins.cc,ChrisCummins/chriscummins.github.io