Add missing premises in tyeq-el-pi and tyeq-el-coerce, move discussion to an isssue
Moved sections to subsections, chopped the rules up into groups.
Eliminators for paths and equalities
Explanation of abstract syntax

Also, reflexivity terms were missing.
Equality reflection rule
Better layout around name-universe, rename congruence rules
Congruence of J and G. This seems quite pointless to write down.