https://html5up.net/ if it is a single landing page. Just grab a template and edit its content to your liking.

Publii if it is some kind of blog or has a few subpages.

That totally depends which institution you want to petition!? Like, how do I officially petition my neighbourhood council? Or how do I petition my boy scout association for something?

There are many cases where it’s just “I and those 50 people want something from a very local instance of something”.

Hell, it could be, that I want to ask my local grocer to list a specific sort of pepper and show them, that he would have more customers than just me, so it’s worth his while.

FWIW Taiga had an rewrite and the successor is https://tenzu.net/en/