To update the website layout, you can go to the public_html/admin/resources/views/site & public_html/admin/resources/views/components folder. It is built with Laravel Blade, Laravel Livewire. If you have experience with Laravel & Livewire, you should be able to make the changes easily.
Next, Go to public_html/admin/resources/var/config.json & public_html/system/resources/var/config.json & change the "footer_credit" variable to your own.
To update the assets, you need to replace images under public_html/admin/public/images & public_html/system/public/images with your own images. Make sure the image sizes are same as the default image size.
If you have any query regarding branding, you can raise a ticket at https://support.kodemint.in or send us an email to email@example.com