title: How to add a stylesheet to the layout's head of a HAML template in Sinatra?
body: <p>I'm searching for a way to add a stylesheet link to the layout's head of a HAML template.</p>
  
  <p>My layout:</p>
  
  <pre><code>!!!
    %html
      %head
        / some stuffs
      %body
        = yield
  </code></pre>
  
  <p>My yielded template:</p>
  
  <pre><code>/ some other stuffs...
  
  /maybe a function like this in order to inject 'my_stylesheet' link in layout
  = content_for_head 'my_stylesheet'
  </code></pre>
  
  <p>Is it possible to do something like that?</p>