Remove website controllers and JSPs

The backend server api.genesys-pgr.org should not render any accession-related information. This should only be accessible via www.genesys-pgr.org.

Update menus to exclude all PGR-related links: browse, datasets, countries, institutes, my list... The main menu should have only the About item.

Update the entry page and remove all accession and institute related information.

Remove all JSP and MVC controllers related to the removed links.