[docs] Some components in docs aren't mobile responsive

[simran-2797]

Description

1. The left navigation on the docs isn't fully responsive in mobile screens.
   

2. When I click on search, the left nav should close and I should be able to see the search bar. Currently, this is what happens:
   

I think the pydata sphinx theme should be mobile responsive. Designs

[peytondmurray]

#41998 called for the sidebar to be fixed width, so this is at least in part a consequence of that change.

But interestingly, pydata-sphinx-theme does have a mobile design:

Maybe this should be labeled as a bug if you're seeing the above on mobile? It might be triggered by certain screen sizes. At least, I know that there are CSS media queries being used which might account for this...