Update docker-compose.yaml

I delete version because is deprecated/obsolete
I added "restart" because help to not start the container every boot
I added also comment to explain how ports work in docker, this help when port 3001 is already used, and need to change for other

docker-compose.yaml

@@ -1,9 +1,12 @@
-version: "3"
 services:
   send2ereader:
     build:
       context: .
       dockerfile: ./Dockerfile
     container_name: send2ereader
+    # Restart means, Automatic re-start the container after a shutdown unless manual stop container
+    restart: unless-stopped
+    # ports means, Bind external and internal docker ports, only change the external port, not the internal port
+    # Arquitecture: <External Port>:<Internal Port>
     ports:
       - 3001:3001