[DOCS] Search is not working on mobile

Created by: ThibaultVlacich

Prerequisites

• I have searched for duplicate or closed issues
• I have validated any HTML to avoid common problems
• I have read the contributing guidelines

Describe the issue

It's impossible to use the search field of the new docs on mobile (Safari on iOS).

When I touch the search field, keyboard is not opening.

https://user-images.githubusercontent.com/334940/180612391-693527fa-cb8e-45fb-a4c5-57eed9dc4361.MOV

Reduced test cases

N/A

What operating system(s) are you seeing the problem on?

iOS

What browser(s) are you seeing the problem on?

Safari

What version of Bootstrap are you using?

N/A