Improve CONTRIBUTING.md #3

	name: xBFreE Documentation
	on:
	push:
	branches:
	- master
	- main

	env:
	PYTHON_VERSION: 3.x

	jobs:
	documentation:
	name: Build documentation
	runs-on: ubuntu-latest
	steps:
	- name: Checkout repository
	uses: actions/checkout@v2
	with:
	# Number of commits to fetch. 0 indicates all history. For mkdocs-git-revision-date-localized-plugin
	# Default: 1
	fetch-depth: 0

	- name: Set up Python runtime
	uses: actions/setup-python@v1
	with:
	python-version: ${{ env.PYTHON_VERSION }}

	- name: Install Python dependencies
	run: \|
	pip install -r ./docs/requirements.txt
	- name: Deploy documentation
	env:
	GOOGLE_ANALYTICS_KEY: ${{ secrets.GOOGLE_ANALYTICS_KEY }}
	run: \|
	mkdocs gh-deploy --force
	mkdocs --version

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