Update README.md

README.md

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-![Build Status Badge](https://circleci.com/gh/yangshun/lago/tree/master.svg?style=shield&circle-token=e360bef41a5f3f6a9c914241f388c93aa7ae6bf8)
-
-Data Structures and Algorithms implemenations in JavaScript.
-
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 <div align="center">
- <h3>💡 Looking for high quality front end interview courses? <a href="https://www.educative.io/explore?search_string=interview&skills=javascript&aff=x23W">Educative</a> offers a ton of great courses to improve your interview game 💡</h3>
+ <h3>💡 Practice implementing Data Structures and Algorithms in JavaScript for free on <a href="https://www.greatfrontend.com/focus-areas/data-structures-algorithms">GreatFrontEnd</a> 💡</h3>
 </div>
 
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 ## Contents
 
-#### Data Structures
+Common Data Structures and Algorithms implementations in JavaScript.
+
+### Data Structures
 
 - [List](src/data-structures/List.ts)
 - [Stack](src/data-structures/Stack.ts)
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 - Suffix Tree (Help Wanted!)
 - Segment Tree (Help Wanted!)
 
-#### Algorithms
+### Algorithms
 
 - [Binary Search](src/algorithms/binarySearch.ts)
 - [Quickselect](src/algorithms/quickSelect.ts)