Add API constant to env

recipes/.env

@@ -1,5 +1,6 @@
 SASS_PATH=node_modules:src
 NODE_PATH=src/
+REACT_APP_API='http://192.168.2.199:3000'
 REACT_APP_API_RECIPES='http://192.168.2.199:3000/recipes'
 REACT_APP_API_PLANNER='http://192.168.2.199:3000/planner'
 REACT_APP_API_SHOPPING='http://192.168.2.199:3000/shopping'

recipes/.env.production

@@ -1,5 +1,6 @@
 SASS_PATH=node_modules:src
 NODE_PATH=src/
+REACT_APP_API='/api/'
 REACT_APP_API_RECIPES='/api/recipes'
 REACT_APP_API_PLANNER='/api/planner'
 REACT_APP_API_SHOPPING='/api/shopping'