Shopify redirect header

theme.liquid

<script>
// Redirect from the Shopify site (except for any account or cart pages)
switch(true) {
    case document.location.href.includes('/cart') :
    case document.location.href.includes('/account') :
        break;

    default:
        window.top.location.href = 'https://shop.example.com/';
        break;
}
</script>

<style>
// Hide the search icon on the login/account pages
.site-header .icon-search {
    display: none !important;
}    
</style>