Blogpost 1.2.0 RC

Topics to cover:

• Testers, test!
• Translators, translate!
• Note and link AIO Deprecation
• Multiarch Docker images
• Master branch will be called stable in the future
• Removed JWT-Auth, so Otter will become unusable -> FFA

This mostly covers the bigger "technical" news, the focus on features will be for the actual release blogpost.