Fixed issues with loading stuff & scrapped proper poll support

Comments, Posts and other stuff should load now correctly again.

Also, I scrapped the full-on poll support and moved back to the simple upvote/downvote graph feature.

There are mainly three reason:

1. I want to prioritize more important features
2. The announcement post had a 0 score for most of the time, just made it to 1 recently. So there isn't much demand I think.
3. While the database & backend was set-up, I think it would be smarter to first add this feature to Lemmy itself.

Let me know if you have any feeling about this decision.