Restructure user guide with subsections #2242

	name: Python Flake8 Linter
	on:
	pull_request:
	jobs:
	flake8-linter:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout source
	uses: actions/checkout@v4
	- name: Install Python 3.11
	uses: actions/setup-python@v5
	with:
	python-version: '3.11'
	- name: Install Flake8 5.0.4 linter
	run: pip install flake8==5.0.4 # use this version for --diff option
	- name: Setup Flake8 output matcher for PR annotations
	run: echo '::add-matcher::.github/workflows/flake8-linter-matcher.json'
	- name: Fetch pull request target branch
	run: \|
	git remote add upstream https://github.com/pvlib/pvlib-python.git
	git fetch upstream $GITHUB_BASE_REF
	- name: Run Flake8 linter
	run: git diff upstream/$GITHUB_BASE_REF HEAD -- "*.py" \| flake8
	--exclude pvlib/version.py
	--ignore E201,E241,E226,W503,W504
	--max-line-length 79
	--diff

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