Less content padding on mobile viewport

[LukasGrafUX]

Prerequisites

• [X] I have read the Contributing Guidelines.
• [X] I have not leaked any internal/restricted information like screenshots, videos, code snippets, links etc.

Suggestion / feature request

Currently, there is 32px of padding left and right for the content area on all viewports.

As we are building mobile PWAs with iX, 32px left/right is too much spacing on mobile viewports, reducing the amount of available width for the content too much.

24px or 16 px are common padding values for mobile apps and breakpoints. it would be great to have that out of the box.