v6.0.0-pre1

this is a pre release

New design is here, thanks to @Timendus for implementing it. #649
Desktop:

Mobile:

Mayor rework of docker deployment.

the new design can be accessed via ?design=new switch to the index page or via config.json, see DESIGN_SWITCH.md

What's Changed

• the new design is ready (after 2 years ;-) )
• Add feature switch for new design via config file, URL parameters, and Docker by @Copilot in #742
• Add GDPR_EMAIL environment variable for Docker deployments by @Copilot in #743

Full Changelog: 5.5.0...v6.0.0-pre1