Modify titles in header

[Mengda-Li]

I modified from title: about to title: Bio in about.md. However, it doesn't change my title in the header which is always a about.
I tried to look at header.html but I cannot find where the problem is.
Besides, can you share your own personal page template codes? There are some fancy features I want to use. (for ex, move mail, linkedin icons to the header. I also want to know how to add custom sections in my header.)

[Mengda-Li]

Finally I figure it out by changing manually names in _includes/header.html. about has a fixed title in this file.

[Mengda-Li]

By setting enable_navbar_social: to true in _config.yml, we can move mail, linkedin icons to the header.