Branding & Page Customization

[birkjernstrom]

Centralized dashboard view to customize Polar Page v2 & branding & design of Polar login, checkout & receipts.

• https://github.com/polarsource/polar/issues/3726
• https://github.com/polarsource/polar/issues/3248
• https://github.com/polarsource/polar/issues/3728
• https://github.com/polarsource/polar/issues/3730