refactor: suppression de la sauvegarde json (JsonExporter, data/)

tests/curl.sh

@@ -34,7 +34,4 @@ echo "== GET /links/999 (introuvable -> 404) =="
 curl -s -w "\n[%{http_code}]\n" "$URL/999"
 
 echo "== DELETE /links/1 (suppression) =="
-curl -s -w "\n[%{http_code}]\n" -X DELETE "$URL/1"
-
-echo "== data.json =="
-cat data/data.json
+curl -s -w "\n[%{http_code}]\n" -X DELETE "$URL/1"