<div class="home-landing">
  <div class="row">
    <%= link_to "Zooniverse Home", "https://www.zooniverse.org", class: "btn btn-default"%>
  </div>
  <div class="row">
    <%= link_to "API Docs", "http://docs.panoptes.apiary.io/#", class: "btn btn-primary"%>
  </div>
  <div class="row">
    <%= link_to "GitHub", "https://github.com/zooniverse/Panoptes", class: "btn btn-info"%>
  </div>
</div>
<div class="home-landing">
  <div class="container">
    <div class="row">
      <div class="col-sm-2 col-sm-offset-4">
        <%= link_to "Sign In", new_user_session_path, class: "btn btn-success"%>
      </div>
      <div class="col-sm-2">
        <%= link_to "Sign Out", destroy_user_session_path, class: "btn btn-danger"%>
      </div>
    </div>
  </div>
</div>

<div class="home-landing">
  <div class="row">
    <%= link_to "Zooniverse Home", "https://www.zooniverse.org", class: "btn btn-default"%>
  </div>
  <div class="row">
    <%= link_to "API Docs", "http://docs.panoptes.apiary.io/#", class: "btn btn-primary"%>
  </div>
  <div class="row">
    <%= link_to "GitHub", "https://github.com/zooniverse/Panoptes", class: "btn btn-info"%>
  </div>
</div>
<div class="home-landing">
  <div class="container">
    <div class="row">
      <div class="col-sm-2 col-sm-offset-4">
        <%= link_to "Sign In", new_user_session_path, class: "btn btn-success"%>
      </div>
      <div class="col-sm-2">
        <%= link_to "Sign Out", destroy_user_session_path, method: :delete, class: "btn btn-danger"%>
      </div>
    </div>
  </div>
</div>

Use appropriate method for sign_out
Use appropriate method for sign_out
