Tangential comment: I just opened the link with the new design on my phone and it was a delight to look at compared to whatever I saw last time. I think the design changes were made keeping in mind smaller screens, which might be what the user data suggested (how am I to know). But I agree with other comments that the top bar content could be aligned with the rest of the content. Stretching it to each end is causing pain.
Most of us don't use GitHub to actually edit code, either. E.g., some projects are using their GitHub repo as the homepage, so I sometimes end up on GitHub on my mobile phone, too.
