Changes to Landing page and related functionality.

Profile:
	- Added README.md.
	- Added CHANGELOG.md.
	- Added Profile node and variables.
Module:
	- Added global layout context.
	- Added basic page content type.
	- Added markdown input filter.
	- Added main menu.
	- Added hook_install().
	- Added various helper functions.
	- Added class based block framework.
	- Added Register Interest email workflow.
	- Added various configuration.
	- Added copyright block.
	- Updated dependencies.
	- Updated Dev environment context.
	- Updated Register Interest entity form.
	- Removed Authenticated homepage (temporarily).
	- Fixed typo in server context.
Theme:
	- Added default background for landing page.
	- Improved footer.