Added NextJS course in Hindi and removed English flutter course from … (#10183)

* Added NextJS course in Hindi and removed English flutter course from hindi courses

* arranged NextJS courses in alphabetical order

courses/free-courses-hi.md

@@ -270,7 +270,6 @@
 * [Flutter Complete Tutorial in Hindi](https://www.youtube.com/playlist?list=PLjVLYmrlmjGfGLShoW0vVX_tcyT8u1Y3E) - WsCube Tech
 * [Flutter Essential Course](https://www.youtube.com/watch?v=Wdx8vwN_nWI) - freecodecamp
 * [Flutter Series 2020](https://www.youtube.com/playlist?list=PLDzeHZWIZsTo3Cs115GXkot28i406511Y) - CodeHelp - by Babbar
-* [Flutter Tutorial for Beginners](https://www.youtube.com/playlist?list=PL4cUxeGkcC9jLYyp2Aoh6hcWuxFDX6PBJ) - The Net Ninja
 * [Flutter Tutorial For Beginners in Hindi](https://youtube.com/playlist?list=PLMkkZSS5OjPIwDyHHKVex6zr008U1-sWM) - Geeks Rank
 * [Flutter Widgets in Hindi](https://www.youtube.com/playlist?list=PLz7ymP4HzwSH3vAnhDWLkO2TLbwGeigl7) - Ahirlog
 
@@ -394,6 +393,7 @@
 #### Next.js
 
 * [Next JS Tutorial for Beginners in Hindi](https://www.youtube.com/playlist?list=PLZjjdd9-SJS2ZvI4ct5Qtkje_Vdb5O_KM) - ILive4Coding
+* [Next js tutorial in Hindi](https://www.youtube.com/playlist?list=PL8p2I9GklV44sj_Ikp8jQSvwD-m9htnHT) - Code Step By Step
 * [Next.js Tutorials for Beginners in Hindi](https://www.youtube.com/playlist?list=PLu0W_9lII9agtWvR_TZdb_r0dNI8-lDwG) - CodeWithHarry
 * [NextJS Tutorial In Hindi](https://www.youtube.com/playlist?list=PLwGdqUZWnOp2rDbpfKAeUi9f8qZMS7_cv) - Vinod Bahadur Thapa (Thapa Technical)