Logo in Navbar

Hello,

I would like to add my logo to the top left of the navigation bar.

On my child theme I have removed the “site-branding” navbar (ie:header .site-branding { display: none; }) and only display the “main-navigation” navbar.
This is so that I only have one navbar on the top of my forum.

Now I would like to add a logo which links to my site homepage (not on WP) at the left of this navbar. How would I do this?

Thank you.