Code of Conduct, Staff Information, Golang Community of India Pages added

1) code of conduct
2) Staff Information
3) Golang community of india

Added these 3 pages in header navigation under about. About is now a drop down and A new link named "What is GopherCon India" is added to link to the about section in the home page.

Also modified the font style across the pages to look better.

Please use "gci-heading" and related classes for headings, un ordered lists etc. Will be optimising the classes little more later.