Improves docs for `tree_at` and `tree_check`. #361

	name: Build docs

	on:
	push:
	branches:
	- main

	jobs:
	build:
	strategy:
	matrix:
	python-version: [ 3.11 ]
	os: [ ubuntu-latest ]
	runs-on: ${{ matrix.os }}
	steps:
	- name: Checkout code
	uses: actions/checkout@v2

	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v2
	with:
	python-version: ${{ matrix.python-version }}

	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	python -m pip install .
	python -m pip install -r docs/requirements.txt

	- name: Build docs
	run: \|
	mkdocs build
	mkdocs build # twice, see https://github.com/patrick-kidger/pytkdocs_tweaks

	- name: Upload docs
	uses: actions/upload-artifact@v4
	with:
	name: docs
	path: site # where `mkdocs build` puts the built site

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