Add hello world data migration
Add hello world data migration

When we launch the new hello world tracks we don't want to make
existing users submit solutions to it, since they clearly already
know how exercism works.

RaptorRCX/exercism.io,amar47shah/exercism.io,chastell/exercism.io,kizerxl/exercism.io,exercistas/exercism.io,alexclarkofficial/exercism.io,IanDCarroll/exercism.io,copiousfreetime/exercism.io,k4rtik/exercism.io,Tonkpils/exercism.io,amar47shah/exercism.io,IanDCarroll/exercism.io,mhelmetag/exercism.io,Tonkpils/exercism.io,kangkyu/exercism.io,nathanbwright/exercism.io,treiff/exercism.io,emilyforst/exercism.io,kangkyu/exercism.io,IanDCarroll/exercism.io,nathanbwright/exercism.io,sheekap/exercism.io,exercistas/exercism.io,alexclarkofficial/exercism.io,chastell/exercism.io,treiff/exercism.io,bmulvihill/exercism.io,jtigger/exercism.io,bmulvihill/exercism.io,alexclarkofficial/exercism.io,copiousfreetime/exercism.io,bmulvihill/exercism.io,tejasbubane/exercism.io,jtigger/exercism.io,colinrubbert/exercism.io,kizerxl/exercism.io,chastell/exercism.io,k4rtik/exercism.io,jtigger/exercism.io,colinrubbert/exercism.io,chinaowl/exercism.io,sheekap/exercism.io,colinrubbert/exercism.io,nathanbwright/exercism.io,Tonkpils/exercism.io,RaptorRCX/exercism.io,exercistas/exercism.io,kizerxl/exercism.io,treiff/exercism.io,mhelmetag/exercism.io,chinaowl/exercism.io,kangkyu/exercism.io,beni55/exercism.io,emilyforst/exercism.io,mhelmetag/exercism.io,emilyforst/exercism.io,chinaowl/exercism.io,Tonkpils/exercism.io,RaptorRCX/exercism.io,beni55/exercism.io,sheekap/exercism.io,jtigger/exercism.io,mhelmetag/exercism.io,tejasbubane/exercism.io,tejasbubane/exercism.io,sheekap/exercism.io,beni55/exercism.io,RaptorRCX/exercism.io,copiousfreetime/exercism.io,tejasbubane/exercism.io,copiousfreetime/exercism.io,nathanbwright/exercism.io,treiff/exercism.io,bmulvihill/exercism.io,k4rtik/exercism.io,IanDCarroll/exercism.io,amar47shah/exercism.io