Add email service and settings

app/views/admin/settings/services/_email.html.erb

@@ -0,0 +1,16 @@
+<h3>E-Mail</h3>
+<ul role="list">
+  <%= render FormElements::FieldsetToggleComponent.new(
+    form: f,
+    attribute: :email_enabled,
+    enabled: Setting.email_enabled?,
+    title: "Enable E-Mail service integration",
+    description: "Enable/configure LDAP attributes for use with a mail server"
+  ) %>
+  <%# <% if Setting.email_enabled? %>
+  <%#   <%= render FormElements::FieldsetResettableSettingComponent.new(
+  <%#         key: :gitea_public_url,
+  <%#         title: "Public URL"
+  <%#       ) %>
+  <%# <% end %>
+</ul>