Added missing ARIA attributes (`aria-label`) to HTML buttons and links #28

Job	Run time
docker-image / codeql / Analyze (javascript)	1m 19s
docker-image / eslint / Run eslint scanning (18)	23s
docker-image / eslint / Run eslint scanning (20)	23s
docker-image / eslint / Run eslint scanning (22)	27s
docker-image / build-image	37s
deploy	23s
	3m 32s

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