Add Berlin video to Events page

Fixes #289

events.html

@@ -53,6 +53,7 @@ <h3>try! Swift 2019 - Tokyo, Japan</h3>
         <div class="event-card-image-container flex-row centre"><img class="event-card-image" src="assets/calendar.png" alt="Swift Summit"></div>
         <div class="event-card-info">
           <h3>ServerSide.swift 2018 - Berlin, Germany</h3>
+          <p><a href="https://www.youtube.com/watch?v=NZwTz8j5GXc">Video: From Idea to Production at ING - Pim Stolk & Ian Partridge</a></p>
           <p><a href="https://speakerdeck.com/ianpartridge/serversideswift-berlin">Slides: Swift on the Server - Ian Partridge</a></p>
           <div class="summary">
             <p>Ian Partridge gave a presentation about server-side Swift with Kitura, including the adoption of Swift on the server and the latest updates to Kitura.</p>