Hi there.
The migration to current app occurs 10 days ago ! We are doing good ! During the migration process I have set some existing images as logo and banner : I am using the exact same BOB logo as on forumtopics. This is cool because it give an identity but the format is not ideal: I think a more larger banner will be better suited for this place.
Here is the recommandation of Discourse:
- logo: Use a wide rectangular image with a height of 120 and an aspect ratio greater than 3:1
- logo small: The small logo image at the top left of your site, seen when scrolling down. Use a square 120 × 120 image
- large icon: Image used as the base for other metadata icons. Should ideally be larger than 512 x 512.
There is a bunch of other (manifest icon, favicon, apple touch, opengraph but derivated from large icon by default so we can work on the 3 initial images only I think)
Who got some talent on design / photoshop / other tool ? 
Do you want to keep BOB ? Do you want to do something else ? Let us know ! We can organize a pool if we have multiple propositions.
