chore: fix URL in global metadata

src/_data/metadata.json

@@ -1,17 +1,17 @@
 {
   "title": "NonSco’llectif",
-  "url": "https://example.com/",
+  "url": "https://nonscollectif.org/",
   "language": "fr",
   "description": "Rétablissons la vérité sur l’instruction en famille",
   "feed": {
     "subtitle": "Rétablissons la vérité sur l’instruction en famille",
     "filename": "feed.xml",
     "path": "/feed/feed.xml",
-    "id": "https://example.com/"
+    "id": "https://nonscollectif.org/"
   },
   "jsonfeed": {
     "path": "/feed/feed.json",
-    "url": "https://example.com/feed/feed.json"
+    "url": "https://nonscollectif.org/feed/feed.json"
   },
   "author": {
     "name": "NonSco’llectif",