- Apply aria-hidden to h3 in Menu template, ensuring the nav landmarks are still properly labeled, but no longer reading duplicate labels to screenreaders
- Remove "Navigation menu" h2 element, which is not needed as the nav landmarks are already labeled
- Remove searchbox h3 element, which is redundant with the search landmark
- Scope all changes to modern vector
Bug: T265993
Change-Id: I4e5da7a0699160fa57234bd126b75243e0157778
bwang