ensure clean _site output

Makefile

@@ -13,6 +13,7 @@ clean:
 	rm -r _site
 
 _site: build
+	rm -rf _site
 	mkdir -p _site
 	docker run milksad-distrust-co tar c -C /usr/share/nginx/html . | tar x -C _site
 

_config.yml

@@ -47,3 +47,7 @@ kramdown:
 
 sass:
   sass_dir: _sass
+
+# ensure some files are not copied to the _site output folder
+exclude:
+  - "*.sh"