Update Language Extensions docs for DEP 12 #15

	#
	# Build HTML documentation on Pull Request
	#

	name: Build documentation

	on:
	pull_request:
	paths:
	- 'documentation/*/.rst'
	- 'documentation/**/conf.py'

	# This enables the Run Workflow button on the Actions tab.
	workflow_dispatch:

	jobs:
	build-documentation:
	runs-on: ${{ matrix.os }}
	strategy:
	matrix:
	os: [ubuntu-latest]

	steps:
	- uses: actions/checkout@v3
	with:
	submodules: recursive

	#
	# Build documentation installing first 'furo' theme dependencies
	#

	- uses: ammaraskar/sphinx-action@master
	with:
	pre-build-command: "echo furo >> documentation/website/requirements.txt"
	docs-folder: "documentation/website"

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