docs(js): add extra detail to sign up & switching auth flows with USER_AUTH #4125

	name: CheckPRLinks
	on:
	pull_request:
	branches: [main]
	types: [opened, synchronize]
	env:
	BUILD_DIR: 'client/www/next-build'
	jobs:
	CheckPRLinks:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout repository
	uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29 # v4.1.6
	- name: Setup Node.js 20
	uses: actions/setup-node@39370e3970a6d050c480ffad4ff0ed4d3fdee5af # v4.1.0
	with:
	node-version: 20.x
	- name: Install Dependencies
	run: yarn
	- name: Run Build
	run: yarn build
	env:
	NODE_OPTIONS: --max_old_space_size=4096
	- name: Run Server
	run: \|
	python -m http.server 3000 -d ${{ env.BUILD_DIR }} &
	sleep 5
	- name: Run Link Checker
	id: checkLinks
	uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1
	with:
	result-encoding: string
	script: \|
	const { checkDevLinks } = require('./tasks/link-checker.js');
	return await checkDevLinks();
	- name: Fail if broken links have been found
	if: ${{ steps.checkLinks.outputs.result }}
	run: exit 1

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