Clear the static directory on each build

bld.sh

@@ -23,6 +23,10 @@ echo "five.tiddlywiki.com" > $TW5_BUILD_OUTPUT/CNAME
 
 mkdir -p $TW5_BUILD_OUTPUT/static
 
+# Delete any existing content
+
+rm -v $TW5_BUILD_OUTPUT/static/*
+
 # First,
 #  readme.md: the readme file for GitHub
 #  index.html: the main file, including content