Add better error messages for show year page folders
Add better error messages for show year page folders

Point of user error, do some regex matching.

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