Finish new docs + demos + website

[WebCoder49]

Aims:

• Make it easier for people to try out code-input
• Make it easier for people to contribute to code-input
• Give code-input a website, a space on the Internet not constrained by GitHub/CodePen.

[WebCoder49-temp]

@WebCoder49 I see that I backtracked on this. It should be reopened.

[WebCoder49]

Also add an FAQs section including #132