I think you're asking two questions which is why there is a split of replies.
I think something like Jekyll or Hugo, while not the simplest, have huge communities with lots of resources and have addressed lots of problems you may encounter so doing something with them is quick despite them not really being simple.
Then there are minimal generators that have minimal amounts of code and then it depends on which languages or tools you feel most comfortable with. Writing your own file processor is quite simple as people point out and you can usually get by with a single file solution.
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I think you're asking two questions which is why there is a split of replies.
I think something like Jekyll or Hugo, while not the simplest, have huge communities with lots of resources and have addressed lots of problems you may encounter so doing something with them is quick despite them not really being simple.
Then there are minimal generators that have minimal amounts of code and then it depends on which languages or tools you feel most comfortable with. Writing your own file processor is quite simple as people point out and you can usually get by with a single file solution.