Let owner configure page appearance

[StegSchreck]

• primary color
• secondary color
• accent color
• header font
• paragraph font

[StegSchreck]

now that feature-toggles exist, this should be easier

[CMMiraflor]

I can work on this. Can you assign this issue to me?

[StegSchreck]

@CMMiraflor sure, go ahead. Looking forward to review your solution.