first commit

_includes/embed/twitch.html

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+<iframe
+  class="embed-video twitch"
+  loading="lazy"
+  src="https://player.twitch.tv/?video={{ include.id }}&parent={{ site.url | split: '://' | last | remove: '/' }}"
+  frameborder="0"
+  allowfullscreen="true"
+  scrolling="no"
+></iframe>