chore(index): remove intro
chore(index): remove intro

avigad/leanprover.github.io,avigad/leanprover.github.io,fpvandoorn/leanprover.github.io,fpvandoorn/leanprover.github.io,fpvandoorn/leanprover.github.io,soonhokong/leanprover.github.io,leanprover/leanprover.github.io,leanprover/leanprover.github.io,soonhokong/leanprover.github.io,leanprover/leanprover.github.io,avigad/leanprover.github.io,soonhokong/leanprover.github.io