switch from LESS to SCSS

SimpleBBBConnector.class.php

@@ -46,7 +46,7 @@ class SimpleBBBConnector extends StudIPPlugin implements SystemPlugin
 
     public function perform($unconsumed_path)
     {
-        $this->addStylesheet('assets/bbb-connector.less');
+        $this->addStylesheet('assets/bbb-connector.scss');
         PageLayout::addScript($this->getPluginURL() . '/assets/bbb-connector-app.js');
         parent::perform($unconsumed_path);
     }

assets/bbb-connector.less → assets/bbb-connector.scss

@@ -35,11 +35,12 @@ table {
 .bbb-metrics {
     .contentbox {
        > section {
-           .flex();
-           .flex-wrap(wrap);
+           display: flex;
+
+           flex-wrap: wrap;
 
            div {
-               .flex-item(1 0 50%);
+               flex: 1 0 50%;
            }
            .ct-label {
                font-size: 1.2rem;