fix the nginx and stmp but re-see listen :80 because it's repeated

nginx.conf

@@ -1,22 +1,3 @@
-upstream front{
-    server front:5000;
-}
-
-upstream back{
-    server back:8080;
-}
-
-upstream etherpad{
-    server etherpad:9001;
-}
-
-upstream db{
-    server db:3306;
-}
-
-upstream smtp{
-    server smtp:25;
-}
 ##########################
 ## FRONTEND + API
 ##########################