[TASK] Don't display small "post here" button under Thread list

Button's functionality is covered by…

* Disabling the hero unit and enabling the toolbar which adds a link in the toolbar
* Disabling the toolbar and enabling the hero unit which adds a button in the hero unit
* Enabling direct commenting which of the button instead renders the complete form

Disabling all of these three options will prevent posting anything but replies to existing posts. This can be useful when running as comment Widget.