Stop tracking .env and set default in docker-compose.yml

.env

@@ -1 +0,0 @@
-PORT=8080

.gitignore

@@ -23,3 +23,7 @@ workspace.xml
 
 # Local scratch files
 notes
+
+# Local overrides
+.env
+docker-compose.override.yml

docker-compose.yml

@@ -21,7 +21,7 @@ services:
   nginx:
     image: nginx:1.15
     ports:
-      - ${PORT}:80
+      - ${PORT:-8080}:80
     volumes:
       - .:/usr/local/src/wellrested
       - ./docker/nginx/site.conf:/etc/nginx/conf.d/default.conf