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  Home Page & Bootstrap

####routes.rb
root 'posts#index'
####application.html.erb
(Use this Bootstrap link here below for consistency, in case Bootstrap's library changes over time.)
...
<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.1/css/bootstrap.min.css" rel="stylesheet">
...
<div class="container">
  <%= yield %>
</div>
...
####app/views/posts/index.html.erb
<div class="jumbotron">
  <h1>My Rails Blog</h1>
</div>
####app/assets/stylesheets/scaffolds.css.scss
(Comment everything out or delete)