simplified setup section #301

	name: Jekyll site CI

	on:
	push:
	# pull_request: # turn on when GA tests need to run on PRs too

	jobs:
	build:
	runs-on: ubuntu-20.04
	steps:
	- uses: actions/checkout@v2
	- name: Setup Ruby
	uses: ruby/setup-ruby@v1
	with:
	ruby-version: 3.1
	- name: Ruby deps
	run: gem install json kramdown jekyll bundler
	- name: Setup Python
	uses: actions/setup-python@v2
	with:
	python-version: '3.x'
	- name: Python deps
	run: pip install pyyaml
	- name: Nokogiri deps
	run: sudo apt install -y pkg-config libxml2-dev libxslt-dev
	- name: Site deps
	run: bundle install
	- name: Build site
	run: bundle exec jekyll build
	- name: Check all lessons
	run: make lesson-check-all

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