move unl_theme and customindex to the plugins folder

plugins/customindex/witw_icons/Michael_Hoff_tiny.jpg

plugins/customindex/witw_icons/Microgravity_Students.jpg

...s/customindex/witw_icons/Microgravity_Students_medium.jpg

...ins/customindex/witw_icons/Microgravity_Students_tiny.jpg

plugins/customindex/witw_icons/Nancy_Andreasen.jpg

plugins/customindex/witw_icons/Nancy_Andreasen_medium.jpg

plugins/customindex/witw_icons/Nancy_Andreasen_tiny.jpg

plugins/customindex/witw_icons/Nithal_Kuwa.jpg

plugins/customindex/witw_icons/Nithal_Kuwa_medium.jpg

plugins/customindex/witw_icons/Nithal_Kuwa_tiny.jpg

plugins/customindex/witw_icons/Pam_Dingman.jpg

plugins/customindex/witw_icons/Pam_Dingman_medium.jpg

plugins/customindex/witw_icons/Pam_Dingman_tiny.jpg

plugins/customindex/witw_icons/Rulon_Gardner.jpg

plugins/customindex/witw_icons/Rulon_Gardner_medium.jpg

plugins/customindex/witw_icons/Rulon_Gardner_tiny.jpg

plugins/customindex/witw_icons/Scott_Killinger.jpg

plugins/customindex/witw_icons/Scott_Killinger_medium.jpg

plugins/customindex/witw_icons/Scott_Killinger_tiny.jpg

plugins/customindex/witw_icons/Shane_Farritor.jpg