added in franchise index

- franchise index page
- edited specific styles to grey scale index elements
- added in extra example images
added link to index and readme

- grouped links by content/index page models
- added link to franchise landing page
Merge pull request #14 from qld-gov-au/franchise-landing-page

Franchise landing page wireframe (closes #2)
merged latest gh-pages #13

- merged latest files from gh-pages branch
- fixed conflicts with README.md