Other than that, I'm perfectly satisfied with the design.
Or maybe it might be a good idea to make the sidebar configurable so everyone can decide what they want to show up there.
sudo echo "127.0.0.1 github.com" >> /etc/hosts
echo "127.0.0.1 github.com" | sudo tee -a /etc/hosts > /dev/null
And in any event, a software such as gitlab doesn't need to be pretty, it needs to be usable, fast and bug-free.
Our dribbble is relatively sparse at the moment, but we do have it: https://dribbble.com/gitlab
We have quite a good UI/UX team in my opinion, but there's a lot of surface area to cover. If there's anything specific you think could be improved upon feel free to open an issue. :)
If anything the bottleneck right now is with frontend developers being able to implement features/design improvements, not with designers.