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Feel free to share more ideas on the Discussions section: https://github.com/Subgin/tonic/discussions
I came across Middleman but it's meant to work with Ruby not necessarily Rails, it's also a bit old although appears kept up to date.
I don't know middleman, but can recommend https://www.bridgetownrb.com/ – it's a modern and well maintained static site generator which supports a lot of technologies known from the Rails world such as HAML through plugins.
I also created a "template" with Bootstrap v5: https://github.com/markets/middleman-bootstrap.