feat: improve extended footer

[FineFindus]

Improves the extended footer, but re-adding the old background color and the icons.

Before	After

[LucasGGamerM]

Oh yeah, I forgot about this.

But there are things that need to change. Firstly, you should revert the color back to normal. As this extended footer is supposed to be above the standard footer. But you can keep the icons, as they are nice :D

[FineFindus]

As this extended footer is supposed to be above the standard footer

Not quite sure what you mean by "above". I changed the colors because that was the color before the merge. I think using the same colors as the background is a bad idea, as it makes it easy to miss. It also helps break up the layout from the currently selected posts to the other posts.

[LucasGGamerM]

See the screenshot as for how I'd like it to look:

This is a screenshot from upstream's implementation, which I quite liked. Although it's debatable whether or not we should follow it instead.of what we were already doing