to a Handlebars {{link-to}} helper: 

{{! ... additional lines...">

  <meta property="og:type" content="website">

<!---->
<meta name="twitter:card" content="summary">

<!---->
<!---->
  <meta name="twitter:title" content="Transitioning to Show Only Complete Todos - Getting Started - Ember Guides">

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  <meta name="twitter:description" content="Next we'll update the application so a user can navigate to a url where only todos that have already been completed are displayed. 

In index.html convert the