feat: prevent BiliBili autoplay to respect web standards

Also, remove BiliBili demo due to very slow loading outside China

modules/blox-tailwind/layouts/_shortcodes/bilibili.html

@@ -1,7 +1,7 @@
 {{- $video_id := cond .IsNamedParams (.Get `id`) (.Get 0) -}}
 {{- $video_page := (cond .IsNamedParams (.Get `p`) (.Get 1)) | default 1 -}}
 <div class="w-full h-auto aspect-video relative">
-  <iframe src="//player.bilibili.com/player.html?bvid={{ $video_id }}&page={{ $video_page }}"
+  <iframe src="//player.bilibili.com/player.html?bvid={{ $video_id }}&page={{ $video_page }}&autoplay=0"
   allow="accelerometer; clipboard-write; encrypted-media; gyroscope; fullscreen; picture-in-picture;"
   class="w-full h-full"
   ></iframe>