Add configname to Posts

Especially with Experience Posts, multiple posts could have the same title (i.e. I could work as a data scientist for multiple companies). Therefore, all of these show up as "Data Scientist" in the admin console, when trying to figure out which post to edit. It would therefore be very helpful to include a configname for each post, which will be displayed only in the config panel, so that the post is more easily identifiable.

Confignames should be unique (i.e. no two posts in the same category can have the same configname)