add peertube support

src/blog/posts/entry4.md

 ---
-title: "All About Coko Architects" 
+title: "All About Coko Architects"
 date: 2022-02-08
 intro: An introduction to Coko Architects
 author: Adam Hyde
 tags: featured
-class: 
+class:
 image: ""
-video: "https://peertube.coko.foundation/videos/embed/c6f4de20-c88e-4995-abd5-ea5a971ed0ae"
+video: <iframe width="560" height="315" sandbox="allow-same-origin allow-scripts allow-popups" title="What are Coko Architects" src="https://peertube.coko.foundation/videos/embed/c6f4de20-c88e-4995-abd5-ea5a971ed0ae" frameborder="0" allowfullscreen></iframe>
 icon: "/images/uploads/architects.png"
 ---

static/css/theme-coko/main.css

@@ -773,3 +773,13 @@ footer section.infos a:hover {
   list-style-position: inside;
 }
 
+article iframe {
+  width: 100%;
+  height: 39em;
+  margin: 4em 0;
+}
+article iframe {
+  grid-column: 1 / end;
+  margin: auto;
+}
+