Rename the program to sww and its deciding daemon to discriminator (closes #218) (#221)

deploy/example-app/Dockerfile

@@ -6,8 +6,8 @@
 # A real app names the smallwebwaf image by digest. This one takes the
 # image script/example-app has just built, or else the one `make docker`
 # builds.
-ARG SMALLWEBWAF_IMAGE=smallwebwaf
-FROM ${SMALLWEBWAF_IMAGE}
+ARG SWW_IMAGE=smallwebwaf
+FROM ${SWW_IMAGE}
 
 # Packages the app needs, from the nixpkgs in the image.
 RUN nix-env -iA nixpkgs.busybox