Refactor admin settings routes

This is much cleaner, and semantically more correct.

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

@@ -0,0 +1,27 @@
+<%= render HeaderComponent.new(title: "Settings") %>
+
+<%= render MainWithSidenavComponent.new(sidenav_partial: 'shared/admin_sidenav_settings') do %>
+  <%= form_for(Setting.new, url: admin_settings_service_path(@service), method: :put) do |f| %>
+    <% if @errors && @errors.any? %>
+      <section>
+        <%= render partial: "admin/settings/errors", locals: { errors: @errors } %>
+      </section>
+    <% end %>
+
+    <section>
+      <%= render partial: @service, locals: { f: f } %>
+    </section>
+
+    <section>
+      <p class="pt-6 border-t border-gray-200 text-right">
+        <%= f.submit 'Save', class: "btn-md btn-blue w-full md:w-auto" %>
+      </p>
+    </section>
+  <% end %>
+
+  <% if content_for?(:documentation) %>
+  <section>
+    <%= yield :documentation %>
+  </section>
+  <% end %>
+<% end %>