Update doc/POST_INSTALL.md

Actions don't exist anymore, config panel is not experimental anymore, and there should already be a link to the bugtracker in the same page this stuff is displayed

Co-authored-by: Alexandre Aubin <4533074+alexAubin@users.noreply.github.com>

doc/POST_INSTALL.md

@@ -8,7 +8,3 @@ To add recipients or to modify the files or apps to backup,please have a look to
 
 Please read the [documentation](https://github.com/maniackcrudelis/archivist/blob/master/Configuration.md) about the configuration of archivist for more information.
 
-You can configure this app easily by using the experimental [config-panel feature](https://__DOMAIN__/yunohost/admin/#/apps/__APP__/config-panel).  
-You can also find some specific actions for this app by using the experimental [action feature](https://__DOMAIN__/yunohost/admin/#/apps/__APP__/actions).
-
-If you're facing an issue or want to improve this app, please open a new issue in this [project](https://github.com/YunoHost-Apps/archivist_ynh).