Use semantic HTML in builder frontend

[earth-walker]

There's a lot of divs being used in the builder frontend which should be changed to contextually appropriate semantic elements. This will improve the accessibility and maintainability of the app.

This will not impact the styling of the app as long as we're using Tailwind: https://tailwindcss.com/docs/preflight

Examples:

<div id="manage-benefits-title" class="text-3xl font-bold mb-2 tracking-wide">Manage Benefits</div> -> should use h2 instead of div

<div onClick={onClick} class=" px-4 py-3 text-md font-bold text-gray-700 rounded-md flex items-center hover:bg-gray-300 cursor-pointer select-none" > {buttonText} </div> -> should use button instead of div

main should be used to wrap the page

section should be used to wrap the view beneath the header and tab bars

article should be used for cards