fix: redirect users to success url after /donation completion (#39404)

config/donation-settings.js

@@ -113,6 +113,12 @@ const paypalConfigurator = (donationAmount, donationDuration, paypalConfig) => {
   };
 };
 
+//
+const donationUrls = {
+  successUrl: 'https://www.freecodecamp.org/news/thank-you-for-donating/',
+  cancelUrl: 'https://freecodecamp.org/donate'
+};
+
 module.exports = {
   durationsConfig,
   amountsConfig,
@@ -124,5 +130,6 @@ module.exports = {
   modalDefaultStateConfig,
   onetimeSKUConfig,
   paypalConfigTypes,
-  paypalConfigurator
+  paypalConfigurator,
+  donationUrls
 };