Booster: add settings for rel=preconnect and rel=dns-prefetch resource hints
- https://web.dev/preconnect-and-dns-prefetch/
- https://wpmudev.com/docs/wpmu-dev-plugins/hummingbird/#preconnect-required-origins
- https://perfmatters.io/docs/preconnect/
Don't forget to consider adding crossorigin="anonymous" when using the 'wp_resource_hints' filter.
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