[fix] Add fallback node in the default config

app/config.json

@@ -31,11 +31,23 @@
     },
     "fallbackNodes": [
       {
-        "host": "g1.duniter.fr",
+        "host": "g1.nordstrom.duniter.org",
         "port": 443
       },
       {
-        "host": "g1.duniter.org",
+        "host": "g1.cgeek.fr",
+        "port": 443
+      },
+      {
+        "host": "g1.monnaielibreoccitanie.org",
+        "port": 443
+      },
+      {
+        "host": "g1.le-sou.org",
+        "port": 443
+      },
+      {
+        "host": "g1.duniter.fr",
         "port": 443
       }
     ],