Update changelog

docs/misc/changelog.md

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 ## Version 2025.01.01 - xx.01.2025
 
-## UI
+### UI
 
 * Change layout
 * Added latest customer list to dashboard
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 * Added latest subscription events to dashboard
 * Added latest payments to dashboard
 
-## Developer
+### Developer
 
 * Change from Postgres to TimescaleDB
 * Dropped support for PHP 8.2
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 * Added a Symfony event for Customer Disabled
 * Upgraded to Symfony 7.2
 
-## Functionality
+### Functionality
 
 * Added invoice delivery methods to include SFTP and Webhooks alongside email
 * Added Invoice formating to include ZUGFeRDv1 and ZUGFeRDv2
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 * Added company name to customer filter on api
 * Added support contact details to brand
 
-## Integrations
+### Integrations
 
 * Added VAT Sense integration