Allow readers to collapse the left and right-hand sidebars when reading documentation

[hamirmahal]

Describe the problem

There's a lot of wasted space when viewing documentation in portrait mode on a desktop monitor.

Describe the proposed solution

Allow readers to collapse the left and right-hand sidebars.

Alternatives considered

Zooming in, which reduces the amount of documentation readers can see onscreen at once

Importance

would make my life easier

[hamirmahal]