HTML proofer should ignore github edit, historym blame links
HTML proofer should ignore github edit, historym blame links

Breaks PR testing

johnathan99j/history-project,newtheatre/history-project,newtheatre/history-project,johnathan99j/history-project,newtheatre/history-project,newtheatre/history-project,newtheatre/history-project,johnathan99j/history-project,johnathan99j/history-project,johnathan99j/history-project