Allow filtering on number of read pages

[owldyn]

Would like to be able to search for not started (but not flagged as "new") and barely started galleries, this should allow that. Figured I would just extend the page number filtering since it can use the same logic.

[Difegue]

Looks good and tests well - No qualms from me on merging this 👍

I'd been thinking of adding an "On Deck" section to the carousel at some point, this'd probably be useful. Thanks!

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[Difegue]

(oh hey holobytes work again that's good to know)