ISTWCMS-3707: adding instagram component

source/_patterns/04-components/instagram/_instagram.scss

+.uw-instagram {
+  display: block;
+  width: 100%;
+
+  &__wrapper {
+    margin-left: auto;
+    margin-right: auto;
+    max-width: 500px;
+
+    iframe {
+      max-width: 500px;
+      width: 100%;
+    }
+  }
+}

source/_patterns/04-components/instagram/instagram.twig

+<div class="uw-instagram">
+  <div class="uw-instagram__wrapper">
+    <blockquote class="instagram-media" data-instgrm-captioned data-instgrm-permalink="{{ instagram.url }}" data-instgrm-version="12" style="max-width: 500px;"></blockquote>
+    <script async src="//www.instagram.com/embed.js"></script>
+  </div>
+</div>

source/_patterns/04-components/instagram/instagram.yml

+instagram:
+  url: 'https://www.instagram.com/p/B-pEhkon9tX'