updating console.log to correct package name

Author: Harshit Pathak

templates/javascript/src/main.js

@@ -1 +1 @@
-console.log('Generated via create-js-app');
+console.log('Generated via @xarv/create-js-app');

templates/typescript/src/main.ts

@@ -1 +1 @@
-console.log('Generated from create-js-app');
+console.log('Generated from @xarv/create-js-app');