Add cesium+ pods

adds cesium+ pods with high uptime measured by https://ginspecte.mithril.re/

app/config.json

@@ -90,6 +90,14 @@
             "host": "g1.data.le-sou.org",
             "port": 443
           },
+          {
+            "host": "g1.data.brussels.ovh",
+            "port": 443
+          },
+          {
+            "host": "g1.data.pini.fr",
+            "port": 443
+          },
           {
             "host": "g1.data.mithril.re",
             "port": 443