doc: update installation instructions to reference stable branch #211

	# Workflow derived from https://github.com/r-lib/actions/tree/v2/examples
	# Need help debugging build failures? Start at https://github.com/r-lib/actions#where-to-find-help
	#
	# Created with usethis + edited to run on PRs to dev, use API key.
	on:
	push:
	branches: [dev, main]
	pull_request:
	branches: [dev, main]
	release:
	types: [published]
	workflow_dispatch:

	name: pkgdown

	jobs:
	pkgdown:
	# only build docs on the main repository and not forks
	if: github.repository_owner == 'cmu-delphi'
	runs-on: ubuntu-latest
	# Only restrict concurrency for non-PR jobs
	concurrency:
	group: pkgdown-${{ github.event_name != 'pull_request' \|\| github.run_id }}
	env:
	GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
	steps:
	- uses: actions/checkout@v3

	- uses: r-lib/actions/setup-pandoc@v2

	- uses: r-lib/actions/setup-r@v2
	with:
	use-public-rspm: true

	- uses: r-lib/actions/setup-r-dependencies@v2
	with:
	extra-packages: any::pkgdown, local::.
	needs: website

	- name: Build site
	env:
	DELPHI_EPIDATA_KEY: ${{ secrets.SECRET_EPIPROCESS_GHACTIONS_DELPHI_EPIDATA_KEY }}
	run: \|
	if (startsWith("${{ github.event_name }}", "pull_request")) {
	mode <- ifelse("${{ github.base_ref }}" == "main", "release", "devel")
	} else {
	mode <- ifelse("${{ github.ref_name }}" == "main", "release", "devel")
	}
	pkgdown::build_site_github_pages(new_process = FALSE, install = FALSE, override=list(PKGDOWN_DEV_MODE=mode))
	shell: Rscript {0}

	- name: Deploy to GitHub pages 🚀
	if: github.event_name != 'pull_request'
	uses: JamesIves/[email protected]
	with:
	clean: false
	branch: gh-pages
	folder: docs

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