Redesign a website front-end

I currently have a 14-year old PHP-based web portal that is in a bad need of redesign. The site serves as a customer portal to a managed service provider. I have some screenshots but to get a better idea of what we are looking at would probably take a meeting. I am not looking to redesign backend functionality but the site needs an updated UI preferably written in REACT or another MVC framework. The total number of pages on the site is about 220.