if header_pages is undefined, then all pages get a link? #4

	name: Step 2, Configure your site

	# This step triggers after the learner update their Pages config file
	# This step sets STEP to 3
	# This step closes <details id=2> and opens <details id=3>

	# This will run every time we update `_config.yml` in the `my-pages` branch
	# Reference https://docs.github.com/en/actions/learn-github-actions/events-that-trigger-workflows
	on:
	workflow_dispatch:
	push:
	branches:
	- my-pages
	paths:
	- _config.yml

	# Reference https://docs.github.com/en/actions/security-guides/automatic-token-authentication
	permissions:
	# Need `contents: read` to checkout the repository
	# Need `contents: write` to update the step metadata
	contents: write

	jobs:
	on_config_update:
	name: On config update

	# We will only run this action when:
	# 1. This repository isn't the template repository
	# Reference https://docs.github.com/en/actions/learn-github-actions/contexts
	# Reference https://docs.github.com/en/actions/learn-github-actions/expressions
	if: ${{ !github.event.repository.is_template }}

	# We'll run Ubuntu for performance instead of Mac or Windows
	runs-on: ubuntu-latest

	steps:
	# We'll need to check out the repository so that we can edit the README
	- name: Checkout
	uses: actions/checkout@v2
	with:
	fetch-depth: 0 # Let's get all the branches
	ref: my-pages

	# Update README to close <details id=2> and open <details id=3>
	# and set STEP to '3'
	- name: Update to step 3
	uses: skills/action-update-step@v1
	with:
	token: ${{ secrets.GITHUB_TOKEN }}
	from_step: 2
	to_step: 3
	branch_name: my-pages

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