How to have custom URL and remove .html extension without Wordpress?

I have made a site which consist of around 10 pages all ending with .html. ( home.html, about.html).

I wish to remove .html extension and change my URLs for example rajat.com/about.html to rajat.com/buy-products-from-me in all my webpages in an easier and less time consuming way as I have already linked my pages

Is there a way to solve this?