Fonts and background colors optimized

Remove the tiles and make it look similar to the old one.
Modify the inner page background to have a same grey used in landing page
Need to revise the fonts (https://github.com/gopherconindia/gopherconindia.github.io/issues/31)
Bug - not able to copy text in inner pages (https://github.com/gopherconindia/gopherconindia.github.io/issues/29)