feat(#31): unknown-metas lint #80

	# The MIT License (MIT)
	#
	# Copyright (c) 2016-2024 Objectionary.com
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	# Permission is hereby granted, free of charge, to any person obtaining a copy
	# of this software and associated documentation files (the "Software"), to deal
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	# SOFTWARE.
	---
	name: markdown-lint
	'on':
	push:
	branches:
	- master
	pull_request:
	branches:
	- master
	concurrency:
	group: markdown-lint-${{ github.ref }}
	cancel-in-progress: true
	jobs:
	markdown-lint:
	runs-on: ubuntu-24.04
	steps:
	- uses: actions/checkout@v4
	- uses: articulate/actions-markdownlint@v1

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