Make headline link in nav

Hi.
Thanks for quick response in this Pull Request:  https://github.com/npm/npm/pull/6615
After that, I tried to read this repository and solve the same problem as the last proposal. Could you please any thought on this please?

Preview:
![preview](http://i.gyazo.com/e5a3a8cf72bf81028aba95ab93256712.png)

Thanks.