updated doc css

Author: raphael-s-steiner

doc/Doxyfile

@@ -1198,8 +1198,7 @@ HTML_STYLESHEET        =
 # list). For an example see the documentation.
 # This tag requires that the tag GENERATE_HTML is set to YES.
 
-HTML_EXTRA_STYLESHEET  = third/doc/style/doxygen-awesome.css \
-                         third/doc/style/doxygen-awesome-sidebar-only.css
+HTML_EXTRA_STYLESHEET  = third/doc/style/doxygen-awesome.css
 
 # The HTML_EXTRA_FILES tag can be used to specify one or more extra images or
 # other source files which should be copied to the HTML output directory. Note