Remove references to config.json's ignore key
Remove references to config.json's ignore key

This key is no longer in use.

petertseng/x-common,jmluy/x-common,jmluy/x-common,petertseng/x-common,ErikSchierboom/x-common,ErikSchierboom/x-common,jmluy/x-common,Vankog/problem-specifications,rpottsoh/x-common,rpottsoh/x-common,exercism/x-common,exercism/x-common,Vankog/problem-specifications