Congrats on this - there are some really good ideas here that would definitely improve Github further. IMHO, there is still room for improvement:
- Mobile - Github's mobile experience is less than desirable, proposing a mobile-first approach here would be amazing;
- Tabs - having a row with more than 10 tabs won't help much on improving the navigation, not to mention localization;
- Overview tab - this is a great idea, but it would depend on the user type. If you are the owner or contributor to the repository, you'd most like benefit from the glanced overview page, but if you are a regular user, you would want to see the Readme.md view to decide if the repo is what s/he is looking for or if it's well documented.
- Mobile - Github's mobile experience is less than desirable, proposing a mobile-first approach here would be amazing;
- Tabs - having a row with more than 10 tabs won't help much on improving the navigation, not to mention localization;
- Overview tab - this is a great idea, but it would depend on the user type. If you are the owner or contributor to the repository, you'd most like benefit from the glanced overview page, but if you are a regular user, you would want to see the Readme.md view to decide if the repo is what s/he is looking for or if it's well documented.