Changes from clone to FGGC Osha site

Several changes made to customize the site for FGGC Osha use.
Modified config.yml
Added new posts
Removed sample posts
Added images
Made some a few layout changes
Made some changes to the includes files, in particular some inelegant
changes to _navigation.html in order to show the logo in place of the
site name.
Update some other pages.
More changes