Add internet draft

[sp4ce]

Related to #19 (comment)

• Move all the jekyll site under the site directly
• Added the steps to build the draft in internet-draft.yml and exposed it under /internet-draft folder. For example from my fork it's here: https://sp4ce.github.io/jsonlines/internet-draft/draft-pernetmugnier-json-lines.html
• When building the site, it would add a commit in gh-pages like Automated Site Deployment.
• When building the internet draft, it would add a commit in gh-pages like Automated Internet Draft Deployment.