add more up to date running instructions

README.md

@@ -22,8 +22,14 @@ proxy server from sources they actually trust.
 
 ## Running the server
 
-Currently you can run with `Mix run --no-halt`, working on a `distillery`
+You can compile a release by running `MIX_ENV=prod mix release`.
-process to compile something nice.
+
+Then to run the server, you can supply your own DNS server via the DOUGH_DNS
+environment variable.
+
+```
+DOUGH_DNS="1.1.1.1" _build/prod/rel/dough/bin/dough foreground
+```
 
 ## Configure Firefox