fix not deleting _meatadata.html

rivet.sh

@@ -126,6 +126,12 @@ if ! [ -e "$footerfile" ]; then
 	echo "Missing _footer.html in $srcdir"
 	exit 1
 fi
+
+if ! [ -e "$metafile" ]; then
+	echo "Missing _metadata.html in $srcdir"
+	exit 1
+fi
+
 # Remove junk from {header,footer} files
 sed -i 's/<header.*>//' "$headerfile"
 sed -i 's/<\/header>//' "$headerfile"
@@ -155,7 +161,7 @@ fi
 rm -rf "$destdir"
 mkdir -p "$destdir"
 cp -r "$srcdir"/* "$destdir"
-rm -f "$destdir"/_header.html "$destdir"/_footer.html
+rm -f "$destdir"/_header.html "$destdir"/_footer.html "$destdir"/_metadata.html
 
 # Generate an ordered (by open time) file list
 find "$srcdir" -type f -regex '.*\/[^_].+\..*' -exec ls -1t {} + |