Update `.editorconfig` to match Angular's
Update `.editorconfig` to match Angular's

This basically makes our `.editorconfig` the same as that used by the
Angular project.

UMM-CSci-3601/3601-lab4_mongo,UMM-CSci-3601/3601-lab4_mongo,UMM-CSci-3601/3601-lab4_mongo,UMM-CSci-3601/3601-lab4_mongo