fix(guide): simplify directory structure

guide/english/javascript/tutorials/give-your-javascript-slot-machine-some-stylish-images/index.md

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+---
+title: Give Your JavaScript Slot Machine Some Stylish Images
+---
+We've already set up the images for you in an array called images. We can use different indexes to grab each of these.
+
+Here's how we would set the first slot to show a different image depending on which number its random number generates:
+
+    $($('.slot')[0]).html('<img src = "' + images[slotOne-1] + '">');