fix dead links in introduction

Please be fixed this time

src/components/marquee/Marquee.astro

@@ -68,11 +68,11 @@ const videos = [
   window.addEventListener("load", autoplayInit, false);
   const videos = document.getElementsByClassName("marquee-item-content") as HTMLCollectionOf<HTMLVideoElement>;
   let currentVideoIndex = 0;
-  let currentVideo = null;
+  let currentVideo: HTMLVideoElement | null = null;
 
   function autoplayInit() {
     setActiveVideo(0);
-    currentVideo.play();
+    currentVideo!.play();
   }
 
   function setActiveVideo(index: number) {
@@ -115,7 +115,9 @@ const videos = [
     video.addEventListener("ended", () => {
       console.log("video ended", "duration", video.duration, "ctime", video.currentTime);
       // The "ended" event might just mean its buffering.
-      if (video == currentVideo && video.duration !== 0 && video.currentTime === video.duration) nextVideo();
+      if (video == currentVideo && video.duration !== 0 && video.currentTime === video.duration) {
+        offsetCarousel(1);
+      }
     });
   }