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 
if client BEMHTML was added just because of

```js
BEMHTML.apply({
                        block: 'comments',
                        elem: 'add-button',
                        elemMods: { type: 'default' }
                    }));
```

which was removed, maybe you revert it as well?