You can do both. Sell a license and sell cloud storage.
The price depends on the market. Some people won’t pay out of principle, and some might even think it’s too cheap if you provide enough value.
The only way to truly know is to actually build it and sell it.
Best of luck!
Static site generators are a dime a dozen. The simplest being just typing HTML into a folder and publishing to a cheap static hosting website (also a dime a dozen).
Hugo and Gatsby are popular SSG, and you can find more in https://staticsitegenerators.net/ and https://jamstack.org/generators/