Ergonomics proposals

**VERSION 1** (do with the existing)
- when you click on the main menu "Ressources", don't display a list but a home page with some documentation and links
- delete "Idées", "Projets", "Ressource", and "Container" from the admin menu
- add 2 sublinks inside each admin menu item : "All the..." and "Add"
- adapt all the titles of the list pages (don't display "Ressources" but the label of the ldp-container you are in
- doing like that, you don't need to display the "Container" list of radio buttons in each entry form anymore (so issue #48 can be close)

**VERSION 2** (if technically possible)
Add a PAIR box in all WP post-types (including custom post types)

No files or tests are named. Start by tracing the WordPress admin menu, list pages, entry forms, and post-type entry points described in the proposal, using the screenshots as reference. The work is done when the Version 1 menu, labels, and container behavior match the requested flow; the Version 2 PAIR box is an additional feasibility-dependent scope.

Written by the indexing model from the issue text.