jekyll-paginate-content

https://github.com/ibrado/jekyll-paginate-content

Jekyll::Paginate::Content splits pages and posts (and other collections/content) into multiple parts/URLs automatically via h1-h6 headers, or manually by inserting something like <!--page--> where you want page breaks. Features: Automatic content splitting into several pages, single-page view, configurable permalinks, page trail/pager, SEO support, self-adjusting internal links, multipage-aware Table Of Contents.