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It depends on how big, and how dynamic it is. While it is possible to make such a site just in html, if it was big or active then it would be a pain to keep up to date. There's a possibility that the sort of site you're after is available, free or at a cost. It would be worth searching...

HTML is fine for a static website- php or some sort of scripting would be needed if you want a website which changes according to user requests of stuff that's in a database- like this site for instance. There are templates available out there, it depends on what you want.