Improvements for artifacts-publications link feature

• Use verbose links for the add elements (e.g. /add/publication/<artifact_id> instead of /add/2/<artifact_id>)
• Remove disabled fields to directly display the data.
• Use bibtexkey instead of publications id for input forms.

For /admin/artifacts-publications/add/artifact/<publication_id>:

• Hide publication ID.
• Better way for selecting the artifact. (Maybe the user could be given an auto-complete based on artifact designation too? They also need to make sure it's the right artifact as if they enter the P# and make a typo, there is no way to see that).
• Publication comments: make it a text area.
• In the list: show the bibtex key field instead of the id to the user as this id is more human-readable.

For /admin/artifacts-publications/add/publication/<artifact_id>:

• Better way for selecting the publication. (Details of the one that was chosen to make sure it's right).
• Add more artifact info for the selected artifact.

For /admin/artifacts_publications:

• Show the bibtexkey instead of id.
• Remove the view in admin and link the public view.