Change header to normal layout.

 On branch master
	modified:   _layouts/default.html
	modified:   _stylesheets/_settings.scss
	modified:   _stylesheets/app.scss
	new file:   _stylesheets/site.scss
Footer styling

	modified:   _layouts/default.html
	modified:   _stylesheets/site.scss
Nav header layout

	modified:   _layouts/default.html
	modified:   _stylesheets/site.scss
Home page layout.

	modified:   _stylesheets/site.scss
	new file:   images/big_sky.jpg
	modified:   index.html