Removed personal account related multi-factor authentication setup modal and otp-input. Adjusted dependencies, exports, and imports to reflect the deletion. Various adjustments in other areas of the codebase were made to account for these deletions, including moving necessary components and adding the 'input-otp' library in the package.json under 'ui' directory.
Deleted the billing-redirect-button, checkout-redirect-button, and embedded-stripe-checkout components. Additionally, removed the shadcn directory, which encompassed billing-related icons. This change streamlines the subscription settings interface and organizes the system's payment management. This update is a stepping stone towards improving the billing system's overall architecture.
