WebUI - Improved "dark" theme (#11417)

* -Real dark mode, (themed bootstrap)
-removed inverted colors in navbar

* Test data

* FIX: navbar in mono theme.

* Dark mode rrdtool

* Changed background on gridster to match background of the dark theme

* - Icons and links now are grey
- Modernized tabs style into pills,
- button pagemenu-selected fixed

* Improvements:
- bootgrid-th, are now visible (dark mode to the table headings)
- Changed line color of poller and ping in rrdtool

* Fix some codeclimate errors

* Fix airos.snmprec, reverted to original file

app/Http/ViewComposers/MenuComposer.php

@@ -62,7 +62,7 @@ class MenuComposer
         // end global Settings
 
         //TODO: should be handled via CSS Themes
-        $vars['navbar'] = in_array($site_style, ['mono', 'dark']) ? 'navbar-inverse' : '';
+        $vars['navbar'] = in_array($site_style, ['mono']) ? 'navbar-inverse' : '';
 
         $vars['project_name'] = Config::get('project_name', 'LibreNMS');
         $vars['title_image'] = Config::get('title_image', "images/librenms_logo_$site_style.svg");