Make readme instructions more legible

Author: tallen42

README.md

@@ -8,8 +8,8 @@ This site is written using [Jekyll](https://jekyllrb.com/), a static site genera
 
 ## Local Development
 
-Build the container and run it! 
-`docker build .`, read the ID from the output, and then `docker run -p 80:4000 [ID]`.
+Build the container:  `docker build -t cshpublicsite .`  
+Run the container: `docker run -p 4000:80 cshpublicsite`  
 You will be able to access the site at http://localhost:4000.
 
 You can either edit files in the container, or rebuild the container when you want to test changes.