migrate apropos data from config/apropos.php to SQLite

- Create apropos_contents table via migration 010
- Add Database methods: getAproposContent(), saveAproposContent(), getAllAproposContents()
- Replace admin/pages.php with admin/contenus.php (renamed header from 'Pages statiques' to 'Contenus')
- Replace admin/pages-edit.php with admin/contenus-edit.php (support editing pages + apropos contents)
- Create admin/actions/apropos.php for saving apropos data (contacts, credits, erg_url)
- Update public/apropos.php to read contacts/credits/erg_url from DB
- Delete config/apropos.php

config/apropos.php

@@ -1,53 +0,0 @@
-<?php
-
-/**
- * À propos page — contacts and credits configuration.
- *
- * Edit this file to update the people listed in the Contacts and Crédits
- * sections of the public "À propos" page without touching the template.
- *
- * contacts[] — each entry:
- *   'name'  string  Full display name
- *   'role'  string  Short description of role (plain text, no HTML)
- *   'email' string  Email address (used for mailto: link)
- *
- * credits[] — each entry:
- *   'label' string  Credit category / title (e.g. "Design & développement")
- *   'value' string  Free-text value; HTML entities will be escaped, so use
- *                   plain text (ampersands written as "&", not "&amp;")
- *
- * erg_url — URL for the "Site de l'erg" link in the aside.
- */
-
-return [
-    'erg_url' => 'https://erg.be',
-
-    'contacts' => [
-        [
-            'name'  => 'Laurent Leprince',
-            'role'  => 'Bibliothèque d’architecture, d’ingénierie architecturale, d’urbanisme (BAIU) :',
-            'email' => 'laurent.leprince@uclouvain.be',
-        ],
-        [
-            'name'  => 'Xavier Gorgol',
-            'role'  => 'Responsable des mémoires de l’ERG :',
-            'email' => 'xavier.gorgol@erg.be',
-        ],
-        [
-            'name'  => 'Brigitte Ledune',
-            'role'  => 'Cours de suivi de mémoire :',
-            'email' => 'brigitte.ledune@erg.be',
-        ],
-    ],
-
-    'credits' => [
-        [
-            'label' => 'Design & développement',
-            'value' => 'Olivia Marly, Théophile Gerveau-Mercie & Théo Hennequin',
-        ],
-        [
-            'label' => 'Typographies',
-            'value' => 'Ductus (Amélie Dumont) & BBB DM Sans',
-        ],
-    ],
-];