Update README

Author: joeyparrish

README.md

@@ -49,7 +49,8 @@ mainly used to organize the source code and keep the non-story elements out of
 the main source file.
 
 Other assets, including CSS, cover art, and other associated, non-story
-content, can all be found in the `MoonShot.materials/` folder.
+content, can all be found in the `MoonShot.materials/` folder or the
+`web-interface/` folder.
 
 The final HTML output goes to `MoonShot.materials/Release/`.