chore: remove Wowchemy as direct dependency in Hello World theme mod

themes/hello-world/config.yaml

@@ -1,6 +1,4 @@
 module:
-  imports:
-    - path: github.com/wowchemy/wowchemy-hugo-modules/wowchemy
   mounts:
     - source: content
       target: content

themes/hello-world/go.mod

@@ -1,5 +1,3 @@
 module github.com/wowchemy/wowchemy-hugo-modules/themes/hello-world
 
 go 1.15
-
-require github.com/wowchemy/wowchemy-hugo-modules/wowchemy master