🧹 Propose to remove channels, notifications, knowledge-graph and phpnode (#55)

* Propose to remove channels and notifications

* Propose to remove knowledge graph too

* Put back tags test

* FIxing tests

* FIx query builder test

tdrive/backend/node/config/custom-environment-variables.json

@@ -24,9 +24,6 @@
       "root": "STATIC_ROOT"
     }
   },
-  "phpnode": {
-    "secret": "PHP_NODE_API_SECRET"
-  },
   "websocket": {
     "auth": {
       "jwt": {
@@ -44,15 +41,6 @@
       "secret": "AUTH_JWT_SECRET"
     }
   },
-  "notifications": {
-    "push": {
-      "type": "PUSH_DRIVER",
-      "fcm": {
-        "endpoint": "PUSH_FCM_ENDPOINT",
-        "key": "PUSH_FCM_KEY"
-      }
-    }
-  },
   "database": {
     "secret": "DB_SECRET",
     "type": "DB_DRIVER",