[Merged by Bors] - feat(set_theory/ordinal/basic): tweak theorems on order type of empty relation #14650
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… relation (#14650) We move the theorems on the order type of an empty relation much earlier, and golf them. We also remove other redundant theorems. `zero_eq_type_empty` is made redundant by `type_eq_zero_of_empty`, while `zero_eq_lift_type_empty` is made redundant by the former lemma and `lift_zero`.
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We move the theorems on the order type of an empty relation much earlier, and golf them. We also remove other redundant theorems.
zero_eq_type_emptyis made redundant bytype_eq_zero_of_empty, whilezero_eq_lift_type_emptyis made redundant by the former lemma andlift_zero.