Support Custom Logo

I have searched the documentation and can not seem to find any information on this. I have a custom logo that I am wanting to use instead of the text name of the support desk.

I have a transparent logo which I use around my site and want to place this with the link back to the main page of the support desk.

Can you please tell me what I need to edit to bring my logo into place.

* Also can I recommend for a future version maybe adding a setting to add a custom logo within the settings to make things easier for people.

Thank you.