Add quicklink

[stereobooster]

Add quicklink, as proposed here #644

Related Firefox issue: GoogleChromeLabs/quicklink#262 (comment)

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[jpanther]

I do wonder how much of a performance benefit this adds to a static site, but I'm not opposed to adding it in. Is it worth limiting how many links can be prefetched?

[stereobooster]

I do wonder how much of a performance benefit this adds to a static site,

Depends how you judge it. Let's say that fastest server (CDN) can deliver HTTP response in 100-200ms (mainly network, I guess server itself would take 1ms max to generate response). It seems like not much, but page navigation (at least to my perception) becomes instant, like in SPA.

Is it worth limiting how many links can be prefetched?

Not sure. quicklink already uses some heuristics, like it preloads only visible links (in viewport)

[jpanther]

Yeah I think this change is not going to cause many issues for the majority of users and if anyone does have a problem it's easy to opt-out with the config flag so I'm happy to merge it in.