fix(guide): simplify directory structure

guide/english/clojure/collections/index.md

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+---
+title: Clojure Collections
+---
+One of Clojure's main positives is that it has quite a few different kinds of sequence: vectors, lists, hashmaps, _oh my!_ And each different type of collection has its own upsides, downsides, and a whole host of useful functions that operate on them.
+
+To understand the differences between each type of collection, when to use each one, and how to convert between them all, it may be necessary to check out other types of collection and remind yourself what makes them special.
+
+As such, this page serves as an index so you can easily view any of the articles about data structures.
+
+*   <a href='http://forum.freecodecamp.com/t/clojure-lists-they-are-everything/18417' target='_blank' rel='nofollow'>Lists</a>
+*   <a href='http://forum.freecodecamp.com/t/clojure-vectors/18421' target='_blank' rel='nofollow'>Vectors</a>
+*   <a href='http://forum.freecodecamp.com/t/clojure-hashmaps/18414' target='_blank' rel='nofollow'>Hashmaps</a>
+
+| [![:point_left:](/images/emoji/emoji_one/point_left.png?v=2 ":point_left:") Previous](http://forum.freecodecamp.com/t/clojure-more-on-functions/18413) | [![:book:](/images/emoji/emoji_one/book.png?v=2 ":book:") Home ![:book:](/images/emoji/emoji_one/book.png?v=2 ":book:")](http://forum.freecodecamp.com/t/clojure-resources/18422) | [Next ![:point_right:](/images/emoji/emoji_one/point_right.png?v=2 ":point_right:")](http://forum.freecodecamp.com/t/clojure-lists-they-are-everything/18417)|  
+| <a href='http://forum.freecodecamp.com/t/clojure-more-on-functions/18413' target='_blank' rel='nofollow'>More on Functions</a> | <a href='http://forum.freecodecamp.com/t/clojure-resources/18422' target='_blank' rel='nofollow'>Table of Contents</a> | <a href='http://forum.freecodecamp.com/t/clojure-lists-they-are-everything/18417' target='_blank' rel='nofollow'>Lists</a>|