Show a carousel view containing randomly picked archives from the current search

[Difegue]

Needs #515.

The goal here is to replace the "Random Archive button" by something that's more visible and gives a bit more choice to the user.

(dodgy html mockup, needs much smaller pictures in a real implementation)

• The carousel should feature 5 to 10 archives from the current search/category
• It should have a refresh button to get a new batch of random archives (not shown on mockup)
• It should be collapsible in order to take up minimal space against the usual list (ideally, as much vertical space as the current Random Archive/Display Options buttons take)
• Ideally, it should be extended to also feature stuff from the other filter buttons so those can be removed from the UI: New Archives, Untagged Archives, Currently Reading/On Deck (new feature!)

[Difegue]

Putting up a bounty link for this due to a demand on the Discord server:

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[Difegue]

The base carousel has been implemented as of the latest commit(random only for now), alongside a bunch of index improvements :

I'm reusing the same components as the thumbnail view for now, but that's open for improvements later on if I feel like the carousel is too tall. (it seems fine as-is! might change my mind with further usage)