Comment count heuristic removed from feed algo

Yesterday, we started rating stories higher in the main feed if they had more comments. A comment essentially counted for half an upvote in the rating formula. Here's the commit.

However, I didn't do that implementation properly; for example, I didn't factor in decaying the noteworthiness of comments that had occurred long ago. And so, while upvotes decayed in relevancy over time, comments didn't.

Today, this led to a weird ranking in the feed and degraded its quality. So, I just removed it.

However, we want comments to influence a story's ranking in the future! Stay tuned.

PS: I now plan to make product updates on the site directly and not in the Telegram channel anymore. We now have comments, so the discussion should move into the product.