feat: update instructions for debian
feat: update instructions for debian

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