Migrate jazzy docset to shared Mapbox theme

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This repository currently defines its own theme that’s very similar to the map SDK theme. We should pull in mapbox/jazzy-theme instead of vendoring the theme to take advantage of a number of improvements in that shared theme, such as inline search and styling of deprecated methods (originally from mapbox/mapbox-gl-native#13827, so that we don’t have to remove documentation when deprecating a method).

The shared theme does have some map SDK–specific aspects. For example, abstract classes are hardcoded (mapbox/jazzy-theme#2), but that just means the navigation SDK’s own abstract classes won’t be called out as such, which wouldn’t be a regression.

/cc @mapbox/navigation-ios @mapbox/docs @julianrex

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