Add Algolia docsearch

[maxiloc]

This PR add Algolia docsearch to the vuejs doc.

You can see it live here: https://vuejs.algolia.com/guide/

Here is a preview:

[yyx990803]

@maxiloc we are live! Thanks a lot, this is awesome!

[yyx990803]

@maxiloc btw, we can totally use this also for http://guide.meteor.com/ - feel free to submit a PR at https://github.com/meteor/guide/tree/master/site , it's also using Hexo :)

[redox]

Looks great guys 👍

[maxiloc]

@yyx990803 Glad that you like it, will work on the meteor one tomorrow

[hootlex]

Very useful, good job 👍

[kazupon]

@maxiloc
Great !! 👍

Can we support the japanese translation site?
That's hosted with vuejs/jp.vuejs.org repository.

[yyx990803]

@maxiloc sorry to bother you again, but we recently moved the Chinese docs to a slightly different domain so that it is faster to access for Chinese users (DNS inside China): http://vuejs.org.cn/

Would you mind adding an index for that site instead of the previous cn.vuejs.org? I sure hope there's an automated way to do this myself, but it seems there is none yet.

[maxiloc]

@yyx990803 Just fixed it. For now we need to modify our crawler manually.
We are on the way to automate everything and let you fix those kind of issues by yourself.
Feel free to ping me anytime if you have any issue (We are pretty reactive 😄)

[yyx990803]

@maxiloc wow that's fast - thanks for the awesome support 👍