Update tutorial links

Author: jeromewu

README.md

@@ -116,7 +116,7 @@ await ffmpeg.run('-i flame.avi -threads 2 flame.mp4');
 
 Learn how to build ffmpeg.wasm from stories:
 
-- [Part.1 Preparation](https://itnext.io/build-ffmpeg-webassembly-version-ffmpeg-js-part-1-preparation-ed12bf4c8fac)
-- [Part.2 Compile with Emscripten](https://itnext.io/build-ffmpeg-webassembly-version-ffmpeg-js-part-2-compile-with-emscripten-4c581e8c9a16)
-- [Part.3 ffmpeg.wasm v0.1— Transcoding avi to mp4](https://itnext.io/build-ffmpeg-webassembly-version-ffmpeg-js-part-3-ffmpeg-js-v0-1-0-transcoding-avi-to-mp4-f729e503a397)
-- [Part.4 ffmpeg.wasm v0.2 — Web Worker and Libx264](https://medium.com/@jeromewus/build-ffmpeg-webassembly-version-ffmpeg-js-part-4-ffmpeg-js-v0-2-web-worker-and-libx264-d0596f1beb4e)
+- [Part.1 Preparation](https://jeromewu.github.io/build-ffmpeg-webassembly-version-part-1-preparation/)
+- [Part.2 Compile with Emscripten](https://jeromewu.github.io/build-ffmpeg-webassembly-version-part-2-compile-with-emscripten/)
+- [Part.3 ffmpeg.wasm v0.1— Transcoding avi to mp4](https://jeromewu.github.io/build-ffmpeg-webassembly-version-part-3-v0.1/)
+- [Part.4 ffmpeg.wasm v0.2 — Web Worker and Libx264](https://jeromewu.github.io/build-ffmpeg-webassembly-version-part-4-v0.2/)