Embed new logo and color

• 👉 Review here 👈

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Adapt along the Helmholtz CI.

• Embed new logo from template project https://codebase.helmholtz.cloud/hifis/overall/templates/-/merge_requests/46
  • Resize
• Adapt Helmholtz Blue color
  • Review / check if this works, especially for large areas (title)
• Adapt other new colors here
• Update favicon(s)
• Update other logo variant(s)
  • logo blue with claim here
• Postpone Adapt video and its embedding
  • especially for preview pic and its embedding
• Adapt most obvious cartoon colors
• Clean up old hard-coded logo mess
• Test Inter font https://fonts.google.com/specimen/Inter ( !790 (merged))
• Probably a lot more ...