Add sphinx_rtd_dark_mode extension. #898

	# This is a basic workflow to help you get started with Actions

	name: CI

	on:
	push:
	branches: [ main ]
	pull_request:
	branches: [ main ]

	workflow_dispatch:

	jobs:
	build:
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v2
	- uses: iterate-ch/sphinx-action@v1.0
	with:
	docs-folder: "."
	build-command: "make dirhtml"
	- name: Cache artifacts
	uses: actions/cache@v2
	if: github.ref == 'refs/heads/main'
	with:
	key: html-${{ github.sha }}
	path: ./_build/dirhtml
	deploy:
	name: Deploy
	runs-on: ubuntu-latest
	needs: build
	if: github.ref == 'refs/heads/main'
	steps:
	- uses: actions/checkout@v2
	- name: Cache artifacts
	uses: actions/cache@v2
	with:
	key: html-${{ github.sha }}
	path: ./_build/dirhtml
	- name: Install Cyberduck CLI
	run: \|
	echo -e "deb https://s3.amazonaws.com/repo.deb.cyberduck.io stable main" \| sudo tee /etc/apt/sources.list.d/cyberduck.list > /dev/null
	sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys FE7097963FEFBE72
	sudo apt-get update
	sudo apt-get -y install duck
	- name: Deploy
	run: .github/sync.sh ./_build/dirhtml
	env:
	AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
	AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
	AWS_DEFAULT_REGION: ${{ secrets.AWS_DEFAULT_REGION }}

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