Remove PSD files from the img folder
Update index.html and description_index.html

These files now display images with the latest version of Emperor i. e.
post view_menu_2 merge.

It also features a couple corrections that @antgonza made to the main
text.
Update files to the latest version of Emperor
Update tutorial images and text

These updates were required based on the latest changes that have
ocurred in the repository.