Change the logic of removal and showing posts

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's no need to require `i-bem` because it's possible to get `blocks` field from `i-bem__dom`:

```js
BEMDOM.blocks.issue.on('process', ...);
```