Add theme support for custom menus

Style main navigation menu

Create image with branding images

Insert search form into header

Initial styling for footer
Include site description

Style site description

Styling for search widget
Add home link to brand logo

Add theme support for widgets in the footer area
Properly configure theme support for footer widgets

Apply basic styling for footer widgets areas
Merge pull request #1 from agrant12/header-footer-implementation

Add theme support for custom menus