Revert "added proper templating section"

Author: JohnGarbutt

example_grafana_dashboard.json

@@ -858,22 +858,7 @@
   "style": "dark",
   "tags": [],
   "templating": {
-    "list": [
-      {
-        "current": {
-          "text": "Prometheus",
-          "value": "Prometheus"
-        },
-        "hide": 0,
-        "label": null,
-        "name": "DS_PROMETHEUS",
-        "options": [],
-        "query": "prometheus",
-        "refresh": 1,
-        "regex": "",
-        "type": "datasource"
-      }
-    ]
+    "list": []
   },
   "time": {
     "from": "now-1h",