Fixed bug to display ratings in episode list

[deeeeekun]

Hi! First of all, let me say I love RateFlix! It has helped me decide which movie to watch on many a night. 😁 I've noticed that episode lists don't show ratings anymore so I tried tweaking around a bit.

Known Issues

1. The way I iterate through mutations might not be how you intended to, judging from the other Observers. I'd gladly tweak them further if you point me in the right direction.
2. I was originally planning on adding the ratings between the title and the progress bar. However, that would mean having to override the current node.appendChild implementation so I just went with appending them after the progress bar. That resulted in an unattractive UI. It'd be nice to get some advice on that, too. Thanks.

Best, David