Add alt+a shortcut for search form and README

Closes #3494646

added 20 commits

• 121c39dc...d2f851b5 - 19 commits from branch project:3.x
• a2c4a7ca - Add alt+a shortcut for search form and README

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added 1 commit

• 90797ab2 - Removed the maintainers section in added README file and improved to the added JS code.

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mentioned in merge request !141 (merged)

Closing in favor of MR !141 (merged).

closed