Upgrade Github actions #133

	name: Build documentation site

	on:
	push:
	branches:
	- master

	jobs:
	mkdocs:
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v2
	- name: Set up Python
	uses: actions/setup-python@v2
	with:
	python-version: 3.9
	- name: Cache pip
	uses: actions/cache@v2
	with:
	path: ~/.cache/pip
	key: ${{ runner.os }}-pip-${{ hashFiles('requirements.txt') }}
	restore-keys: \|
	${{ runner.os }}-pip-
	${{ runner.os }}-
	- name: Run script
	run: bash .github/workflows/mkdocs/mkdocs.sh
	shell: bash

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