Branding Customization #27

Goal

Allow customizing the Incus UI branding

High-level requirements

• Setting ui.branding.title should change the name of the interface from "Incus UI" to the specified name (header on sidebar, page titles, etc.)
• Setting ui.branding.favicon should set the favicon to the specified URL
• Setting ui.branding.logo should change the logo from the LinuxContainers logo to the logo defined at the URL

Context

Information on configurable option handling: #26

Constraints

No response

Additional information

It would be a good idea to turn some of these things into re-usable getters. For example, the name and logo of the interface is re-used in multiple areas.