Please provide more detailed documentation on how to use callback, panel_theme_, sub_panel_theme, and sub_panel_css

Issue Summary

'callback' => '_administration_sub_dashboard_page',
'panel_theme' => 'cs_administration_menu_panel',
'sub_panel_theme' => 'cs_administration_sub_menu_panel',
'sub_panel_css' => 'dashboard',

Also, do you want to use title and description in for both sections and items? Would it be better to have item_title and item_description?