allow /discord relative link in content validation tests

Author: fturmel

content-testing/schemas.js

@@ -289,7 +289,7 @@ const socialGroup = strictObject({
   title: string().required(),
   links: array(
     strictObject({
-      url: string().url().required(),
+      url: urlOrRelativeLinkValidator.required(),
       site: string()
         .oneOf(['twitter', 'discord', 'instagram', 'youtube', 'github'])
         .required()

content-testing/validators.js

@@ -319,7 +319,8 @@ const relativeLinks = {
   '/guides': slugs.guides,
   '/showcase': new Set(),
   '/faq': new Set(),
-  '/about': new Set()
+  '/about': new Set(),
+  '/discord': new Set()
 };
 
 const urlOrRelativeLinkValidator = string().test(