Add 2 flutter course on free-courses-id.md (#5665)

* Add 4 course on free-courses-id.md

* fixing linter failed on courses

* add 4 course on free-courses-id.md

* remove kotlin free course on free-courses-id.md

* remove unused line on kotlin

Co-authored-by: Muhamad Arif Ar Rijal <>

Author: arif-arrijal

courses/free-courses-id.md

@@ -100,6 +100,8 @@
 
 ### Flutter
 
+* [Belajar Fundamental Aplikasi Flutter](https://www.dicoding.com/academies/195) - Dicoding, membutuhkan registrasi
+* [Belajar Membuat Aplikasi Flutter untuk Pemula](https://www.dicoding.com/academies/159) - Dicoding, membutuhkan registrasi
 * [Flutter Membangun Website](https://buildwithangga.com/kelas/flutter-membangun-website-sederhana?thumbnail=nk4neM2UyG.110&main_leads=browse) - BuildWithAngga
 * [Flutter Tutorial (Flutter Fundamentals)](https://www.youtube.com/playlist?list=PLZQbl9Jhl-VACm40h5t6QMDB92WlopQmV) - Erico Darmawan Handoyo
 * [STUDI KASUS FLUTTER + GETX + FIREBASE [ CHAT APPS 2021 ]](https://www.youtube.com/playlist?list=PL7jdfftn7HKt6wPnVXoXgserU14d_ACA-) - Sandikha Rahardi, Kuldii Project (YouTube)