Adds video capability (#2354)

Signed-off-by: Fanit Kolchina <kolchfa@amazon.com>

_includes/youtube-player.html

@@ -0,0 +1,15 @@
+<!--
+Copyright (c) 2020 Nathan Lam
+https://github.com/nathancy/jekyll-embed-video
+-->
+
+<div class="embed-container">
+    <iframe
+        src="https://www.youtube.com/embed/{{ include.id }}"
+        width="640"
+        height="385"
+        frameborder="0"
+        allowfullscreen="true"
+        allow="accelerometer; clipboard-write; encrypted-media; gyroscope; picture-in-picture">
+    </iframe>
+  </div>

_sass/_web-embed.scss

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+/* 
+Copyright (c) 2020 Nathan Lam
+https://github.com/nathancy/jekyll-embed-video 
+*/
+
+.embed-container {
+    position: relative;
+    padding-bottom: 56.25%;
+    height: 0;
+    overflow: hidden;
+    max-width: 100%;
+  }
+  
+.embed-container iframe, .embed-container object, .embed-container embed {
+    position: absolute;
+    top: 0;
+    left: 0;
+    width: 100%;
+    height: 100%;
+  }