Add "Fork us" button to home webpage

[dilumn]

Right now gh-pages branch has the web documentation of scikit-api. It's better if we can add a "Fork Us" button at the top of the web page as most of the documentation websites do these days.

That button will redirect the user to a new tab with this repository on github

[roboflank]

@dilumn Working on it

[roboflank]

Kindly Test and look at
#54

[dilumn]

@denzelwamburu Could you please add that button Right aligned on top of the Home page as well?

[roboflank]

@dilumn okay great.