implement branded theme for application and landing page

[chunnodu]

implement this theme https://tweakcn.com/themes/cmi5zp1yy000204l7ci2t6qfk?p=colors
for the application and landing page

[chunnodu]

This wasn't in scope, but I think the email look should change as well, what do you think

[Nwabuogo]

Primary font: iA Writer Quattro S (for heading texts)

Secondary font: Inter (for body texts)