ISTWCMS-4210 Add mathjax.js to libraries and attach to page

uw_cfg_common.libraries.yml

@@ -33,3 +33,6 @@ uw_layout_inverted_l_left:
   css:
     theme:
       layouts/uw-inverted-l-left/uw-layout-inverted-l-left.css: {}
+uw_mathjax:
+  js:
+    https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.7/MathJax.js?config=TeX-AMS_HTML: { type: external, minified: true }

uw_cfg_common.module

@@ -259,6 +259,14 @@ function uw_cfg_common_preprocess_node(&$variables) {
   }
 }
 
+/**
+ * Implements hook_page_attachments().
+ */
+function uw_cfg_common_page_attachments(array &$page) {
+  $page['#attached']['library'][] = 'uw_cfg_common/uw_mathjax';
+
+}
+
 /**
  * Implements hook_form_FORM_ID_alter().
  *