added devcontainer.

fix build error, deploy using docker-compose works,
misc changes
using global MQTT instead of local one to tap to already existin broker

package.json

@@ -6,7 +6,9 @@
   "scripts": {
     "pm2": "pm2 start ecosystem.config.js --no-daemon",
     "dev": "nodemon dht.js",
-    "start": "node dht.js"
+    "startold": "node dht.js",
+    "start": "node index.js",
+    "start:debug": "node --inspect=0.0.0.0:9229 index.js"
   },
   "repository": {
     "type": "git",