About page contact email (#1839)

* Correct site_contact_email typo

* Separate about more page into partials, add specs

app/views/about/_contact.html.haml

@@ -0,0 +1,15 @@
+.panel
+  .panel-header= t 'about.contact'
+  .panel-body
+    - if contact.contact_account
+      .owner
+        .avatar= image_tag contact.contact_account.avatar.url
+        .name
+          = link_to TagManager.instance.url_for(contact.contact_account) do
+            %span.display_name.emojify= display_name(contact.contact_account)
+            %span.username= "@#{contact.contact_account.acct}"
+
+    - if contact.site_contact_email
+      .contact-email
+        = t 'about.business_email'
+        %strong= contact.site_contact_email