Add a `tel:` link to the About Page (#246)

just like a `mailto:` link triggers an email, a `tel:` link will allow you to call someone directly from the page. I've added this.

layouts/partials/sections/about.html

@@ -30,6 +30,8 @@
           <li>
             {{ if eq .name "Email" }}
               <a href="mailto:{{ .url }}" target="/"><i class="{{ .icon }}"></i></a>
+            {{ else if eq .name "Phone" }}
+              <a href="tel:{{ .url }}" target="/"><i class="{{ .icon }}"></i></a>
             {{ else }}
               <a href="{{ .url }}" target="/"><i class="{{ .icon }}"></i></a>
             {{ end }}