Update ghcjs.md
Update ghcjs.md

Add "Comunity Repacks" section I put the latest ones, but there will be a need for a table with earlier versions.
(PS. feel free to merge and improve grammar or spelling, it will be quicker)
deech/stack,MichielDerhaeg/stack,Fuuzetsu/stack,AndreasPK/stack,deech/stack,martin-kolinek/stack,juhp/stack,anton-dessiatov/stack,mrkkrp/stack,mrkkrp/stack,MichielDerhaeg/stack,AndreasPK/stack,anton-dessiatov/stack,martin-kolinek/stack,Fuuzetsu/stack,juhp/stack