Add link to github from documentation. (#1425)
Add link to github from documentation. (#1425)

* Add link to github from documentation.

* Add fork me on github banner.

stephanie-wang/ray,pcmoritz/ray-1,ray-project/ray,pcmoritz/ray-1,richardliaw/ray,robertnishihara/ray,ray-project/ray,stephanie-wang/ray,robertnishihara/ray,robertnishihara/ray,richardliaw/ray,stephanie-wang/ray,atumanov/ray,robertnishihara/ray,stephanie-wang/ray,atumanov/ray,ray-project/ray,ujvl/ray-ng,ujvl/ray-ng,atumanov/ray,richardliaw/ray,stephanie-wang/ray,pcmoritz/ray-1,pcmoritz/ray-1,ray-project/ray,atumanov/ray,atumanov/ray,ray-project/ray,robertnishihara/ray,robertnishihara/ray,ray-project/ray,pcmoritz/ray-1,richardliaw/ray,richardliaw/ray,robertnishihara/ray,ujvl/ray-ng,pcmoritz/ray-1,robertnishihara/ray,richardliaw/ray,stephanie-wang/ray,ray-project/ray,atumanov/ray,ujvl/ray-ng,atumanov/ray,stephanie-wang/ray,stephanie-wang/ray,ray-project/ray,richardliaw/ray,pcmoritz/ray-1,stephanie-wang/ray,robertnishihara/ray,richardliaw/ray,atumanov/ray,pcmoritz/ray-1