add CNAME file to define custom domain for GH Pages #5

	name: fluffy docs CI

	on:
	push:
	branches:
	- master
	paths:
	- '.github/workflows/fluffy_docs.yml'
	- 'fluffy/docs/**'

	permissions:
	contents: write
	jobs:
	deploy:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- uses: actions/setup-python@v4
	with:
	python-version: 3.x
	- run: echo "cache_id=$(date --utc '+%V')" >> $GITHUB_ENV
	- uses: actions/cache@v3
	with:
	key: mkdocs-material-${{ env.cache_id }}
	path: .cache
	restore-keys: \|
	mkdocs-material-
	- run: pip install mkdocs-material
	- name: Run mkdocs github deploy
	working-directory: ./fluffy/docs/the_fluffy_book/
	run: \|
	mkdocs gh-deploy --force

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