Handle verification metadata to help with web crawlers

[tobySolutions]

The verification object in the layout's metadata helps to make the site have a proper indexing with web crawlers when people look for our website. We would need to obtain keys from google, yandex and yahoo to set this up in the codebase.

According to : https://nextjs.org/docs/app/api-reference/functions/generate-metadata#verification, https://medium.com/@davegray_86804/next-js-how-to-submit-your-sitemap-to-google-36a859c4d114