add syntax highlighting for json examples

[mathroc]

Syntax highlighting is done with prism.js. there's different theme but I stayed with the default one. let me know if you like another one more ;)

I didn't add syntax highlighting in the spec documents. do you think I should ?

closes #49

[Relequestual]

Thanks for the PR. I do actually need to work out how to run the site localy!
Hum. I THINK that the spec documents are built from the specification XML, although I'm not 100% sure. @awwright ?

[mathroc]

@Relequestual this time I used jekyll with docker, if you already have docker installed, it really easy : https://github.com/jekyll/docker/wiki/Usage:-Running

[Relequestual]

Thanks @mathroc - I don't have it installed, but there's another issue which explains how to use jekyll from commandline... think it's one of these tabs....

[agebhar1]

@Relequestual if you need some help on this let me know

[Relequestual]

Thanks @agebhar1, realistically I can't spend the required time this month to look at this =/

[Relequestual]

@mathroc Could you set up a preview by allowing github pages on your forked version of the project? @agebhar1 did this at #69 (comment) and it made confirming a lot easier. I still haven't had time to chekcout your PR and look.

[mathroc]

thx @Relequestual , I had no idea I could do that, here it is : https://mathroc.github.io/json-schema-org.github.io/

[Relequestual]

Neither did I!

Don't mind me changes theme OK THEN.