Add next/prev page, jump to start/end to user config

[Toaster192]

resolves #482
@AndydeCleyre, @vidurb might want to know

This allows the 4 keybinds to be bound to something else (something that doesn't colide with people's tmux keybinds and such)

[Rigellute]

This should be a great addition. Thank you for your work on this.

Looks like we'd want to also update the handlers in these files, to use the new next/prev page config

src/handlers/home.rs
src/handlers/album_list.rs

[vidurb]

Thanks very much, @Toaster192

Your efforts are much appreciated.

[Toaster192]

@Rigellute Good catch, thanks!
@vidurb Thanks for the kind words!
I've literally never before worked with Rust so please excuse me if there are any stupid mistakes (tho it's just a few lines of code)

[Rigellute]

Thank you! 👏

[Rigellute]

@all-contributors please add @Toaster192 for code

[allcontributors]

@Rigellute

I've put up a pull request to add @Toaster192! 🎉