Add Web3Auth Dashboard setup guide

Author: rtomas

src/common/guides/src/common/guides/_web3auth_dashboard_setup.mdx

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+If you haven't already, sign up on the Web3Auth platform. It is free and gives you access to the
+Web3Auth's base plan. After the basic setup, explore other features and functionalities offered by
+the Web3Auth Dashboard. It includes custom verifiers, whitelabeling, analytics, and more. Head to
+[Web3Auth's documentation](/docs/dashboard-setup) page for detailed instructions on setting up the
+Web3Auth Dashboard.