mdhelp: clean up the toc (again) mdhelp: add help doc for the about tab (webui_about...

mdhelp: clean up the toc (again) mdhelp: add help doc for the about tab (webui_about) and rename the old about page to doc_about mdhelp: replace "Access Configuration" text with "Users" in the docs and class captions so that it matches with the interface mdhelp: when there is no doc associated with a Help button rather than displaying a dialog (that the user has to dismiss) show the Help window instead, only display the dialog when the toc fails to load mdhelp: remove old dvr file