chore(header/header.tex): remove page number from title page
chore(header/header.tex): remove page number from title page

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