Update YouTube video player width to 100% in introduction.md (#78)

Author: hasit

docs/introduction.md

@@ -10,7 +10,7 @@ description:
 slug: "/"
 ---
 
-<iframe width="560" height="315" src="https://www.youtube.com/embed/3SyUOSebG7E?si=i0oT9RAnH0PW81lY" title="YouTube video player" frameBorder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerPolicy="strict-origin-when-cross-origin" allowFullScreen></iframe>
+<iframe width="100%" height="315" src="https://www.youtube.com/embed/3SyUOSebG7E?si=i0oT9RAnH0PW81lY" title="YouTube video player" frameBorder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerPolicy="strict-origin-when-cross-origin" allowFullScreen></iframe>
 
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