update thermal diffusion documentation #2506

	name: docs build

	on:
	push:
	branches:
	- development
	- main
	pull_request:
	branches:
	- development

	env:
	# enable color output from Sphinx
	FORCE_COLOR: "1"

	jobs:
	docs:
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v4
	with:
	fetch-depth: 0
	- name: Install pandoc and doxygen
	run: \|
	sudo apt install pandoc doxygen

	- name: Setup Python
	uses: actions/setup-python@v5
	with:
	python-version: '3.11'
	cache: "pip"

	- name: Install dependencies
	run: pip install -r ./requirements.txt

	- name: Build docs
	run: \|
	cd Docs/
	# remove missing TOC entries that would otherwise be generated by
	# doxygen to avoid warnings about missing references
	sed -i -e 's/^ filelist$//; s/^ classlist$//' source/index.rst
	make SPHINXOPTS='-v -W --keep-going' NO_DOXYGEN=TRUE html

	- name: Check links
	run: \|
	cd Docs/
	make SPHINXOPTS=-v NO_DOXYGEN=TRUE linkcheck

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