mycroft default configuration changes.

- Do not use Vosk for "wake up" by default
- No VAD configured by default. Let the user choose it on the platform it supports.
- Set autogen_meta to false to prevent writing json settings in non writable path.

buildroot-external/rootfs-overlay/etc/mycroft/mycroft.conf

@@ -14,10 +14,6 @@
   "listener": {
     "mute_during_output": false,
     "instant_listen": true,
-    "VAD": {
-      "module": "ovos-vad-plugin-webrtcvad",
-      "ovos-vad-plugin-webrtcvad": {"vad_mode": 3}
-    },
     "retry_mic_init" : false
   },
   "hotwords": {
@@ -27,15 +23,6 @@
       "sensitivity": 0.5,
       "trigger_level": 3,
       "expected_duration": 3
-    },
-  "wake_up": {
-      "module": "ovos-ww-plugin-vosk",
-      "rule": "equals",
-      "samples": [
-        "wake up"
-      ],
-      // wakeupwords are only used in SLEEPING mode
-      "wakeup": true
     }
   },
   "tts": {
@@ -46,7 +33,8 @@
     }
   },
   "skills": {
-    "wait_for_internet": true
+    "wait_for_internet": true,
+    "autogen_meta": false
   },
   "Audio": {
     "backends": {