Settings UI: Migrate to two column design

[danieldudzic]

Description

This PR migrates the design to two columns as per the latest Figma files.

This PR also removes the icons in the Overview tab (next to the titles).

Steps to test

1. Make sure the settings are being displayed with headings on the left and content on the right.
2. Ensure the two columns collapse to one on mobile.

Screenshots

Before	After