Build out search function

[jueyang]

We are thinking of auto complete with the linkable subject titles.

[jueyang]

Currently the search function is using jquery autocomplete. The search is based on the chapter name since it's the easiest to implement.

There's one .json file associated with each language. I've made the en.json. Will get to other languages once more content migration happens.

I passed in a nosearch parameter so that posts such as 404, guide covers, etc. will not be included in the json. For example:

layout: default
title: 404 - page not found
permalink: /en/404.html
lang: en
nosearch: true 

It'd be great if the search can be operated based on all the h2, h3 content (thus the attempt to use node) However this is not a priority now.

[jueyang]

closing. Search on the site is running with jquery autocomplete for chapter names. ref #123