Add Sass CLI steps

docs/_includes/steps/create-html-page.html

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+{% capture step_4 %}
+  <div class="content">
+    <p>
+      Create an HTML template which uses several Bulma components.
+    </p>
+  </div>
+
+  {% highlight html %}{% include snippets/mypage.html %}{% endhighlight %}
+
+  <div class="content">
+    <p>
+      Save this file as <code>mypage.html</code>.
+    </p>
+    <p>
+      Notice the <code>css/mystyles.css</code> path for your stylesheet. This will be the location of the CSS file we will generate with Sass.
+    </p>
+    <p>
+      Open the page in your browser:
+    </p>
+  </div>
+
+  {%
+    include components/figure.html
+    path="customize/custom-bulma-01-unstyled"
+    extension="png"
+    alt="Bulma unstyled"
+    width="600"
+    height="300"
+    caption="The unstyled page"
+  %}
+{% endcapture %}
+
+{% assign step_title = ". Create an HTML page" | prepend: include.number %}
+
+{% include components/step.html
+  title=step_title
+  content=step_4
+%}