6175815 Fix logo url in index.html and templates

Authored and Committed by bex 5 years ago
    Fix logo url in index.html and templates
    
    - Remove unused book logo background
    - Moving template footer into page.html.erb
    
        _footer.html.erb could not access images_path
    
        This breaks logos everywhere :(
    
        See: https://github.com/redhataccess/ascii_binder/issues/95
    
        
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