🎨 Update hero illustrations for events

Change default hero illustration to wedding and adjust New Year's
event handling to include both New Year's Eve and Day.

✨ Introduce lifetime subscription feature

Add functionality for users to purchase lifetime access, including
Stripe integration for payment processing and email notifications
upon activation. Update views and routes accordingly.

✨ Introduce event preservation feature

Add functionality for users to preserve events permanently through
Stripe payments. Includes email notifications and UI updates for
preserved events.

✨ Introduce approaching deletion feature for events

Add a new route and view for displaying events approaching deletion,
including pagination and improved UI elements for better user experience.

💄 Add EU data storage and GDPR section

Introduce a new section detailing data storage within the EU and compliance
with GDPR, enhancing transparency regarding user data protection.