Missing links on gh-pages

[Daijiro Wachi]

aigis/docs seems missing link. You can see it is used on the following pages:

• docs link on http://pxgrid.github.io/aigis/sample/
• Documents link on http://pxgrid.github.io/aigis/

[Naohiro Nakajima]

@watilde
Thanks for report!

I fixed it 👍

[Daijiro Wachi]

thanks!