fix(site): replace example mp4 with real

closes #200

site/src/components/HomePageDemo/Base.tsx

@@ -9,7 +9,7 @@ function generateHTMLCode(skin: Skin): string {
 
   return `<video-provider>
   <${skinTag}>
-    <video src="https://example.com/video.mp4"></video>
+    <video src="https://stream.mux.com/lhnU49l1VGi3zrTAZhDm9LUUxSjpaPW9BL4jY25Kwo4/highest.mp4"></video>
   </${skinTag}>
 </video-provider>`;
 }
@@ -26,7 +26,7 @@ export const VideoPlayer = () => {
   return (
     <VideoProvider>
       <${skinComponent}>
-        <Video src="https://example.com/video.mp4" />
+        <Video src="https://stream.mux.com/lhnU49l1VGi3zrTAZhDm9LUUxSjpaPW9BL4jY25Kwo4/highest.mp4" />
       </${skinComponent}>
     </VideoProvider>
   );

site/src/content/blog/2019-01-11-video-js-7-4.mdx

@@ -11,9 +11,6 @@ tags:
 authors: [gary-katsevman]
 ---
 
-
-
-
 It's time to have an overview of Video.js 7.4, first released early December. The big new feature for this release is a UI that allows you to seek during live streams. We updated focus-visible to work with our Menus, added more translations, added a replay option to the Play/Pause button, and many, many fixes, multiple of which are accessibility related.
 
 We also dropped our usage of Grunt from our build process. We owe a lot to Grunt as it has served us well but it was time to move on.
@@ -64,7 +61,7 @@ var player = videojs('my-id', {
 Or HTML:
 ```html
 <video-js id="my-id" data-setup='{"liveui": true}'}>
-  <source src="https://example.com/live.m3u8" type="application/x-mpegurl">
+  <source src="https://stream.mux.com/lhnU49l1VGi3zrTAZhDm9LUUxSjpaPW9BL4jY25Kwo4/highest.mp4" type="application/x-mpegurl">
 </video-js>
 ```