chore(*): update web.config fallback url to support client side rendered routes in prerendered app

Author: mddragnev

web.config

@@ -26,7 +26,7 @@
           <add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true" />
           <add input="{REQUEST_FILENAME}" matchType="IsDirectory" negate="true" />
         </conditions>
-        <action type="Rewrite" url="/angular-demos/" />
+        <action type="Rewrite" url="/angular-demos/index.csr.html" />
       </rule>
       <rule name="Angular Root Redirect" enabled="true" stopProcessing="true">
         <match url="^/?$" />