Refactor about.php

- Hardcode source code URL and credits in about template, remove from DB/admin interface; only contacts remains editable
- Merge apropos editables into one À propos section, remove charte, add editable source code URL

app/storage/schema.sql

@@ -408,8 +408,8 @@ SELECT * FROM smtp_settings WHERE id = 1;
 
 CREATE TABLE IF NOT EXISTS apropos_contents (
     id         INTEGER PRIMARY KEY AUTOINCREMENT,
-    key        TEXT NOT NULL UNIQUE,             -- 'contacts', 'credits', 'erg_url'
-    value      TEXT,                              -- JSON array or plain string
+    key        TEXT NOT NULL UNIQUE,             -- 'contacts'
+    value      TEXT,                              -- JSON array
     updated_at DATETIME DEFAULT CURRENT_TIMESTAMP
 );
 
@@ -433,23 +433,6 @@ INSERT OR IGNORE INTO apropos_contents (key, value) VALUES
       {"text": "Brigitte Ledune", "url": "", "email": "brigitte.ledune@erg.be"}
     ]
   }
-]'),
-    ('credits', '[
-  {
-    "label": "Design & développement",
-    "entries": [
-      {"text": "Olivia Marly", "url": ""},
-      {"text": "Théophile Gerveau-Mercie", "url": ""},
-      {"text": "Théo Hennequin", "url": ""}
-    ]
-  },
-  {
-    "label": "Typographies",
-    "entries": [
-      {"text": "Ductus (Amélie Dumont)", "url": ""},
-      {"text": "BBB DM Sans", "url": ""}
-    ]
-  }
 ]');
 
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