[openstreetmap/openstreetmap-website] If http2 supported, disable tile domain sharding (#2584)

[Guillaume Rischard]

Domain sharding [is an http/2 antipattern](https://love2dev.com/blog/domain-sharding-http-2/). Browsers and servers are supposed to detect sharding, but that doesn't always happen, for example if a.tile and b.tile resolve to different IP addresses - and even then, it still takes a bit of extra effort.

This detects whether the client is connecting over http/2, and instructs it not to use four subdomains to load tiles.

If the browser supports http/2, use a.tile.openstreetmap.org instead of {switch:a,b,c,d}.tile.openstreetmap.org and gps-a.tile.openstreetmap.org/lines/{z}/{x}/{y}.png instead of https://gps-{s}.tile.openstreetmap.org/lines/{z}/{x}/{y}.png.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/2584

-- Commit Summary --

  * If http2 supported, disable tile domain sharding

-- File Changes --

    M vendor/assets/leaflet/leaflet.osm.js (26)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/2584.patch
https://github.com/openstreetmap/openstreetmap-website/pull/2584.diff

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