README: Remove -p 8000:8000 from docker run params

Author: mateumann

README.md

@@ -16,7 +16,7 @@ docker build -t factory:local .
 Once you have an image built, run it like
 
 ```sh
-docker run --rm --name factory --network=host -p 8000:8000 factory:local
+docker run --rm --name factory --network=host factory:local
 ```
 
 This snippet is intended just for testing the app, it is usually not a good
@@ -190,4 +190,4 @@ curl -s http://localhost:8000/materials/oxygen | jq
 
 There are other endpoints, not described in this short README file. Feel
 free to investigate them on your own by browsing files in the `routers/`
-directory.
+directory.