lint: fix `MD007/ul-indent` rule

Unordered list indentation [Expected: 4; Actual: 2]

books/free-programming-books-langs.md

@@ -1295,9 +1295,9 @@ That section got so big, we decided to split it into its own file, the [BY SUBJE
 * [React Succinctly](https://www.syncfusion.com/ebooks/react-succinctly) - Samer Buna
 * [React Tutorial](https://reactjs.org/tutorial/tutorial.html)
 * React Tutorial by Josh Finnie
-  * [Part 1](http://www.joshfinnie.com/blog/reactjs-tutorial-part-1/)
-  * [Part 2](http://www.joshfinnie.com/blog/reactjs-tutorial-part-2/)
-  * [Part 3](http://www.joshfinnie.com/blog/reactjs-tutorial-part-3/)
+    * [React Tutorial - Part 1](http://www.joshfinnie.com/blog/reactjs-tutorial-part-1/)
+    * [React Tutorial - Part 2](http://www.joshfinnie.com/blog/reactjs-tutorial-part-2/)
+    * [React Tutorial - Part 3](http://www.joshfinnie.com/blog/reactjs-tutorial-part-3/)
 * [React with ASP.NET Core Tutorial](https://reactjs.net/getting-started/aspnetcore.html)
 * [React.js Tutorial: Now is Your Time to Try It, Right in Your Browser](https://codegeekz.com/react-js-tutorial/)
 * [SurviveJS - Webpack and React](http://survivejs.com)

courses/free-courses-si.md

@@ -30,4 +30,3 @@
 #### React
 
 * [Fundamentals \| React JS in Sinhala](https://youtube.com/playlist?list=PLvvtf05eMZ2DpDyWwmAjEuicvVxx4vIYB) - Fiqri Ismail (YouTube)
-