fix(guide): simplify directory structure

guide/english/certifications/javascript-algorithms-and-data-structures/es6/import-a-default-export/index.md

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+---
+title: Import a Default Export
+---
+## Import a Default Export
+
+<!-- The article goes here, in GitHub-flavored Markdown. Feel free to add YouTube videos, images, and CodePen/JSBin embeds  -->
+Importing an export default is almost the same as importing a normal export; you just don't need the curly braces to define the name of what you're importing from the file!
+
+## Hint 1:
+
+Fill in the blanks: `import _ from "file-name"`. Plug in your module's name (which is `subtract`) into `_`, and put `"math-functions"` into `"file-name"`.
+
+## Spoiler Alert - Solution Ahead!
+
+## Solution:
+
+```javascript
+"use strict";
+import subtract from "math_functions";
+subtract(7,4);
+```