Improve table of contents intersection observer #64
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I’ve played with a couple different strategies.
This PR adds code to actually recreate the intersection observer entirely when the window resizes. This lets us use really specific margins based on the window’s
clientHeightinstead of trying to get percentage margins to work OK across all viewport heights. It’s slightly more JS, but we’re debouncing the resize event & waiting for idle in browsers that support that, so should be pretty performant.