add the performance monitoring section to the admin page

app/views/admin/_monitoring.html.haml

@@ -0,0 +1,2 @@
+%div
+  %iframe.embed-responsive.w-100.border{src: 'rails/performance', style: 'height:100vh;'}

app/views/admin/index.html.haml

@@ -11,7 +11,7 @@
 
 %div
   %div.mx-1
-    - sections = [t('admin.index.analytics'), t('admin.index.site_administration'),t('admin.index.ontology_administration'),  t('admin.index.licensing'), t('admin.index.users'), t('admin.index.metadata_administration'), t('admin.index.groups'), t('admin.index.categories'), t('admin.index.persons_and_organizations'), t('admin.index.sparql'), t('admin.index.search')]
+    - sections = [t('admin.index.analytics'), t('admin.index.site_administration'),  "Performance Monitoring", t('admin.index.ontology_administration'),  t('admin.index.licensing'), t('admin.index.users'), t('admin.index.metadata_administration'), t('admin.index.groups'), t('admin.index.categories'), t('admin.index.persons_and_organizations'), t('admin.index.sparql'), t('admin.index.search')]
     - selected = params[:section] || sections.first.downcase
     = render Layout::VerticalTabsComponent.new(header:  t('admin.index.administration_console'), titles: sections, selected: selected, url_parameter: 'section') do |t|
       - t.item_content do
@@ -22,6 +22,8 @@
           = render 'analytics'
       - t.item_content do
         = render 'main'
+      - t.item_content do
+        = render 'monitoring'
       - t.item_content do
         %div
           %table{:style => "float:left;"}