STCOM-1392 Use `h3` instead of `h1` for menu. #551

Job	Run time
ui / Set shared variables	1s
ui / Run Jest tests	0s
ui / Compile translations / Compile translations	34s
ui / Run Bigtest tests / Run Bigtest tests	2m 20s
ui / version-number / Get CI version number	5s
ui / Install and lint / Install and lint	1m 4s
ui / Generate module descriptor	0s
ui / Okapi dependency check (main branch/release only)	0s
ui / Publish module descriptor (main branch/release only)	0s
ui / Publish module (main branch/release only)	0s
ui / SonarCloud analysis / SonarCloud analysis	47s
	4m 51s

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