Remove all Cakifo shortcodes

* [entry-format] isn't being used in the theme
* The overwrite of [entry-published] and [comment-published] doesn't
work after Hybrid Core commit d48d9fdd3eb64b3fd947848c0a723fc78af759f2
and the <time> element was added in
4b84c07444b7682e9d19509698ff35aae69f000b