fix(guide): simplify directory structure

guide/english/certifications/responsive-web-design/css-grid/add-rows-with-grid-template-rows/index.md

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+---
+title: Add Rows with grid-template-rows
+---
+## Add Rows with grid-template-rows
+
+In this challenge, you are required to define rows for the CSS grid in `<div class="container">`.
+
+### Hint
+ 
+You can define rows by using the `grid-template-rows` CSS property.
+
+### Solution
+
+Since the challenge requires you to create two rows of `50px` each, declare the followin in your `.container` CSS code block:
+ 
+````css
+grid-template-rows: 50px 50px;
+````