Setting up on your Synology NAS is not very time consuming. Follow these steps on Synology’s website: How do I host a website on my Synology NAS? - Synology Knowledge Center. Get/transfer a domain (I did so through noip.com). Copy all your website files, keeping the same directory structure, to \web on your NAS.
Best of all, no fees to pay for web hosting but there is a small annual fee for the domain ($15US) unless you use a Synology-provided domain name.