Rework inf arch for the site

Site
  - Header-nav (Docs - Help - Blog)
  - Landing page
    - Intro
    - CTAs
      - Get Started
      - Watch Talks
      - Learn more / Docs
    - Who is using OC

Some points
- Move to oc-template-react
- Bring documentation to site from wiki
- Create configuration for who use OC so that will be easy for others to add themselves