add editoria demo

src/articles/ssp-editoria.md

@@ -6,6 +6,9 @@ date: "2021-09-13"
 category: "study-paper"
 ---
 <p>note: we are still migrating this article here and some videos are yet to be added.</p>
+    <video controls>
+      <source src="/images/uploads/editoriaDemo.webm" type="video/webM">
+    </video>
    <p class="paragraph"><em>This article is a case study of a </em><a
         href="https://coko.foundation/single-source-publishing/" rel target="blank"><em>Single Source
           Publishing</em></a><em> platform for books&#x2014;</em><a href="https://coko.foundation/product-suite/" rel