Migration blog january

[DibranMulder]

This pull request includes a comprehensive update to the migration announcement blog post in the yivi-docs repository. The update details the migration of various Yivi components to a new hosting environment, addressing technical debt and ensuring long-term sustainability. The most important changes include the addition of a migration overview table, detailed sections on the migration of specific components, and improvements to the email and demo environments.

Migration details and improvements:

• Added a migration overview table listing resources, their old and new locations, and planned migration dates.
• Detailed sections on the migration of specific components, including Mail, Demo environments, Atumd server, Email issuer, SMS issuer, IDIN issuer, YiviConnect, and Keyshare Server.
• Improved email experience by introducing new email addresses and ensuring data protection within the European Union.
• Enhanced demo environments by migrating them to new subdomains within the Yivi infrastructure for better accessibility and branding.
• Outlined the process and impact of migrating the Keyshare server with measures to ensure continuity of service.