XWIKI-12942: Retire Colibri skin

xwiki-platform-core/pom.xml

xwiki-platform-core/xwiki-platform-colibri/pom.xml

...latform-core/xwiki-platform-colibri/src/assemble/skin.xml

...m-colibri/src/main/resources/colibri/attachmentsinline.vm

...orm-colibri/src/main/resources/colibri/attachmentslist.vm

...i-platform-colibri/src/main/resources/colibri/colibri.css

...form-colibri/src/main/resources/colibri/colorThemeInit.vm

...form-colibri/src/main/resources/colibri/commentsinline.vm

...latform-colibri/src/main/resources/colibri/companylogo.vm

...tform-colibri/src/main/resources/colibri/contentheader.vm

...latform-colibri/src/main/resources/colibri/contentmenu.vm

...latform-colibri/src/main/resources/colibri/contentview.vm

...iki-platform-colibri/src/main/resources/colibri/delete.vm

...orm-colibri/src/main/resources/colibri/docdoesnotexist.vm

...i-platform-colibri/src/main/resources/colibri/docextra.vm

...xwiki-platform-colibri/src/main/resources/colibri/edit.vm

...latform-colibri/src/main/resources/colibri/editactions.vm

...-platform-colibri/src/main/resources/colibri/editclass.vm

...platform-colibri/src/main/resources/colibri/editinline.vm

...i-platform-colibri/src/main/resources/colibri/editmenu.vm