Change the logic of removal and showing posts

Ready to merge

1) We show post with all issues status (open & closed)
2) Hide post if it has a labels named `removed`
3) If post has status `closed` - then we tag it as "the answer"

// cc @tadatuta @tormozz48 @gela-d 
there is `3000` in `configs/common/node.json`in this PR.
is it ok?