Fix typos in _layouts/about.html (alshedivat#739)

Author: alshedivat

_layouts/about.html

@@ -18,9 +18,9 @@ <h1 class="post-title">
               {%- assign profile_image_path = page.profile.image | prepend: 'assets/img/' -%}
 
               {% if page.profile.image_cicular %}
-              {%- assign profile_image_class = "img-fluid z-dept-1 rounded-circle" -%}
+                {%- assign profile_image_class = "img-fluid z-depth-1 rounded-circle" -%}
               {% else %}
-              {%- assign profile_image_class = "img-fluid z-dept-1 rounded" -%}
+                {%- assign profile_image_class = "img-fluid z-depth-1 rounded" -%}
               {% endif %}
 
               {% include figure.html