Add _/.header-adwords & _/.footer-adwords

Add _/.header-adwords & _/.footer-adwords to the repo

- Both of these serve the CTA adwords pages. They interact with the
_/header-products. It is decided through the {adwords} dropdown on
channel:entries.
Add _/.header-products

Add _/.header-products which interacts with a lot of Channels &
Templates.

- Training
- CTA
- Form
Add _/.header-index

Add _/.header-index to repo which works with Homepage

It’s mostly used for those page that include Navigation, but not
anything beneath, and just filled with {index-body}
Add _/.header & _/.footer

Add _/.header & _/.footer to the repo. These are needed for general
static pages, and general pages without much configurability.