[Misc] set AIBrix documentation link in Website under About

[nurali-techie]

Hi folks,

We have very good documentation at -- aibrix.readthedocs.io This link is part of readme too but I see that it would be good if we set it in "Website" under "About". This will give faster access and easily noticeable to users.

Plz see the attached image.

Thanks, Nur

[googs1025]

cc @Jeffwan