Build a website using Generic cms and Recat technolog

I need a fitness website that is developed using React as Frontend technology and headless CMS like starpi , contentful and sanity for the Backend. The website should have Login and sign-up page through which a user can access our website. The content in the main page is BMI calculation and calorie table with reference to current weight and target weight.

Below i have shared a rough which you can get an idea of my design