perf(v2): add link rel preconnect for GA & google tag plugin

[endiliey]

Motivation

This PR requires #2057 to be looked first It's a PR for a PR. Just so that lerna changelog can pick it up

https://css-tricks.com/using-relpreconnect-to-establish-network-connections-early-and-increase-performance/

As suggested by lighthouse, can save few seconds

Have you read the Contributing Guidelines on pull requests?

yes

Test Plan

[yangshun]

Very cool 😎

[endiliey]

Seems that we need to modify the gtag plugin too ? Such that it doesnt wait till js load for it to append the script

I’m talking about this

docusaurus/packages/docusaurus-plugin-google-gtag/src/gtag.js

Line 35 in 522dd2d

const $scriptEl = window.document.createElement('script');

[endiliey]

OOps i merged it to wrong branch

[yangshun]

Just push to master lol

…

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