Migrate from jinja2 to just plain python dictionaries

brian_dashboard_manager/templating/templates/nren_access/nren-dashboard.json.j2

-{
-  "annotations": {
-    "list": [
-      {
-        "builtIn": 1,
-        "datasource": "-- Grafana --",
-        "enable": true,
-        "hide": true,
-        "iconColor": "rgba(0, 211, 255, 1)",
-        "name": "Annotations & Alerts",
-        "type": "dashboard"
-      }
-    ]
-  },
-  "editable": false,
-  "gnetId": null,
-  "graphTooltip": 0,
-  "schemaVersion": 27,
-  "style": "dark",
-  {% if not tags %}
-  "tags": ["{{ tag }}"],
-  {% else %}
-  "tags": [
-    {% for tag in tags %}
-      "{{ tag }}"{{ "," if not loop.last }}
-    {% endfor %}
-  ],
-  {% endif %}
-  "templating": {
-    "list": []
-  },
-  "time": {
-    "from": "now-24h",
-    "to": "now"
-  },
-  "timepicker": {},
-  "timezone": "",
-  "title": "{{ nren_name }}",
-  "version": 1,
-  "links": [],
-  "panels": [
-    {
-      "datasource": null,
-      "gridPos": {
-        "h": 1,
-        "w": 24,
-        "x": 0,
-        "y": 0
-      },
-      "id": 1,
-      "options": {
-        "content": "",
-        "mode": "html"
-      },
-      "pluginVersion": "8.2.5",
-      "title": "INFO: The average values displayed are only mean values for timescales of 2 days or less",
-      "type": "text"
-    },
-    {% for panel in aggregate_panels %}
-        {{ panel }},
-    {% endfor %}
-    {% for group in dropdown_groups %}
-      {{ group.dropdown }}
-      {% if group.panels|length > 0 %}
-        ,
-      {% endif %}
-      {% for panel in group.panels %}
-        {{ panel }}{{ "," if not loop.last }}
-      {% endfor %}
-      {{ "," if not loop.last }}
-    {% endfor %}
-  ]
-}
\ No newline at end of file