Added more info to How to contribute

[nvk]

Move running environment to a second page, ie #9

[hosiawak]

• Moved How to contribute to /faq
• Added link to FAQ in nav
• Added github-pages config (Ruby) in addition to Grip (Python)

[nvk]

Merged; FAQ now going 404 on live site.

IIRC Github pages default setup will read other root .md files as secondary pages.

[hosiawak]

Looking