Release 1.18.1 (#1012)

* add caps checks for processing of content type

* release version bumps

* changelog

* 1006 noopener removal (#1007)

* remove rel=noopeners and some target=blank attributes

* change from twitter to x

* fix placeholder numbering

* Fix/1003 slug already exists messaging (#1008)

* fix checked check

* build copy

* remove neglected changelog section of about page to instead focus on readme version exclusively (#1011)

* fill in release date

* css builds, npm is weird

* package-lock version

Author: tw2113