Remove extra punctuation

Author: heathermiller

blog/_posts/2017-05-19-scastie.md

@@ -12,7 +12,7 @@ use Scala in the browser over at
 
 ## What is Scastie?
 
-**Scastie is... Scala + sbt in your browser!**. You can:
+**Scastie is... Scala + sbt in your browser!** You can:
 
 - use any version of Scala (scalac), or even alternate backends such as Dotty, Scala.js, Scala Native, and Typelevel Scala.
 - use any library published on Maven.
@@ -61,10 +61,9 @@ sharing snippets, and support for Scala.js!
 
 We collaborated with <a href="https://www.47deg.com/" target="_blank">47Deg</a> to provide a fresh UI.
 
-<a href="/resources/img/blog/scastie/newui.png" target="_blank">
-  <img alt="scastie screenshot"
-       src="/resources/img/blog/scastie/newui.png">
-</a>
+
+<iframe src="https://www.youtube.com/embed/IWirQc3lTy4"
+  width="610" height="315" frameborder="0" allowfullscreen></iframe>
 
 ### Sharing
 
@@ -87,12 +86,10 @@ HTML DOM elements referred in your code such as images appears in the editor for
 
 Since the execution environment is your browser, you can set breakpoints in your
 javascript inspector. Source mapping is enabled and allowing you to step into
-your Scala code.
+your Scala code. This video illustrates how you can debug Scala.js.
 
-<a href="/resources/img/blog/scastie/Scala-js-debug.png" target="_blank">
-  <img alt="scastie screenshot"
-       src="/resources/img/blog/scastie/Scala-js-debug.png">
-</a>
+<iframe src="https://www.youtube.com/embed/7RpbfmLiFQA"
+  width="610" height="315" frameborder="0" allowfullscreen></iframe>
 
 You can try it out yourself: [ray tracer](https://scastie.scala-lang.org/9ZgBIUCQQ6u8bRaJFLI0Yg)
 ([Li Haoyi](https://github.com/lihaoyi) is the author of this demo)
@@ -139,4 +136,4 @@ Scastie is an original idea from Aleh Aleshka ([OlegYch](https://github.com/Oleg
          src="/resources/img/blog/scalacenter/47deg-logo.png">
   </a>
   47Deg worked on the UI design.
-</div>
+</div>