Copy static files over to the output directory.

src/config/full.rs

@@ -88,4 +88,8 @@ impl Config {
             .and_then(|stream| stream.entries_per_page)
             .unwrap_or(5)
     }
+
+    pub(crate) fn get_relative_path_to_static_files(&self) -> PathBuf {
+        Path::new("static").into()
+    }
 }