Add `build` section to `.readthedocs.yml` #392

	name: Docs

	on:
	push:
	branches: [ master ]
	pull_request:
	branches: [ master ]

	jobs:
	build:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	- name: Set up Python
	uses: actions/setup-python@v1
	with:
	python-version: '3.8'
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	python -m pip install -r docs/requirements.txt
	- name: Build the documentation
	run: \|
	cd docs/
	make html

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