Add GitHub action to ensure docs are correctly built #4

	name: Build documentation
	on: [push, pull_request]
	env:
	SPHINXOPTS: -W --keep going

	jobs:
	build-docs:
	name: Build documentation
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	- uses: ammaraskar/sphinx-action@master
	with:
	docs-folder: "doc"
	pre-build-command: 'pip install sphinx_rtd_theme'

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