fix(a11y): implemented best practices of Lighthouse #7025

Job	Run time
Proselint (ubuntu-latest, lts/*)	43s
Unit Test (ubuntu-latest, lts/*)	47s
Lint (ubuntu-latest, lts/*)	1m 6s
E2E test and link check (ubuntu-latest, lts/*)	8m 16s
	10m 52s

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