Maybe/maybe not? Deno is a new-er runtime for JavaScript and TypeScript by the creator of Node.js. It's essentially an effort to correct the perceived shortcomings of Node.js with a new runtime that is: 1. compatible with TypeScript, 2. aligns closer with browser APIs, and 3. comes with a standard library modeled after Go's.
It would be great for a 1 visit per hour site, but so would PHP, or just an index.html file. Hard to really answer that question without knowing what your site is.
I keep hearing and reading about Deno too but I don't understand why I or my project would need or want it or consider switching to it. What does it give me, how is it better, why is it better. I'm confused on why I would pay for hosting? You're not alone.