fix(guide): simplify directory structure

guide/english/javascript/tutorials/subtract-one-number-from-another-with-javascript/index.md

@@ -0,0 +1,8 @@
+---
+title: Subtract One Number from Another with JavaScript
+---
+We can also subtract one number from another.
+
+JavaScript uses use the - symbol for subtraction.
+
+    var difference = 45 - 33;