fix(Makefile): use leanprover/pygments-main
fix(Makefile): use leanprover/pygments-main

Hodapp87/cs6460_project,Hodapp87/cs6460_project,soonhokong/lean-tutorial,avigad/tutorial,leanprover/tutorial,avigad/tutorial,avigad/tutorial,cjmazey/fork_leanprover_tutorial,cjmazey/fork_leanprover_tutorial,cjmazey/fork_leanprover_tutorial,leanprover/tutorial,soonhokong/lean-tutorial,fpvandoorn/tutorial,soonhokong/lean-tutorial,Hodapp87/cs6460_project,fpvandoorn/tutorial,fpvandoorn/tutorial,leanprover/tutorial