Update Sandbox_usage.md #161

	name: Documentation Build

	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@v2
	with:
	python-version: '3.8'

	- name: Install dependencies
	run: \|
	python -c "import sys; print(sys.version)"
	python -m pip install --upgrade pip setuptools wheel
	pip install -r requirements.txt

	- name: Build docs
	run: mkdocs build

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