Scalable super sidebar width

What does this MR do and why?

sidebar width in rems for font-sizes >16px

Before	After

How to set up and validate locally

• Enable new nav
• set browser font size to larger than default

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.