Merge pull request microsoft#88 from microsoft/psl-showdown-pkg

fix: Update Showdown Package Locally to Resolve Bug15178

Author: Roopan-Microsoft

src/frontend/wwwroot/libs/showdown.min.js

@@ -126,7 +126,7 @@ <h1 id="taskName" class="title"></h1>
     ></script>
     <script
       type="text/javascript"
-      src="https://unpkg.com/showdown/dist/showdown.min.js"
+      src="../libs/showdown.min.js"
     ></script>
     <script src="../utils.js"></script>
     <script src="../app.js"></script>