Improve Profile Pages

[brillout]

The checklist is still live at https://github.com/ghuser-io/ghuser.io/tree/daa1867de83c86a616d8d7791374d17ed252bf75/ui-feedback

Feel free to review as much or as less as you want.

On top of my head, some things we do differently code-wise:

• I try to make non-local var names unique. Including css class names. Because JS/CSS is not typed and searching for a CSS class name ".icon" is not convenient.
• I choose inline styles over global CSS class names
• I'm ok with big files. I'd choose one big file and a clean interface over many smaller files. E.g. Contrib.js is relatively big now which I like because it encapsulates lot's of code.

[lourot]

Many repo icons are actually missing on the tiny contribs. For these tiny contribs, you forgot to fall back to the org icons if there is no icon defined in the repo settings. For example on your own profile, your tiny contrib to facebook/react should have the icon of the facebook org.