Implement same header from getalby.com on blog.getalby.com

[MoritzKa]

Let's have a concise online appearance with the same header on all of our online offerings i.e. on blog.getalby.com

• Information about how to customize the template on our Ghost blog: https://ghost.org/docs/themes/custom-settings/
• Instructions: https://www.mindspun.com/blog/theming-your-ghost-site/
• Theme can be down- and uploaded here: https://alby.ghost.io/ghost/#/settings/design/change-theme

[secondl1ght]

This is now complete.