[Functionality] provide left and right `sidebar` arrangements

[possumbilities]

Problem

Presently the sidebar area only appears on the right of a two column layout within specific contexts. There are situations where it would merit having the sidebar appear on the left side instead.

Description

This might be attached and intersect with wholly new contexts overall, but there should rules and layouts which adequately support the sidebar appearing on either side not as an overall possibility for every use case, but from a contextualized use case.

Implementation

• [x] I would be interested in implementing this feature.

[TimidRobot]

Please also consider Right-to-left (RTL) pages

CC BY 4.0 English with side bar on right

https://creativecommons.org/licenses/by/4.0/legalcode.en

CC BY 4.0 Arabic with side bar on left

https://creativecommons.org/licenses/by/4.0/legalcode.ar