Like the title says - I've added support for more standard.site documents, leaflet.pub and pckt.blog. You can install at-astro-loader using pnpm i at-astro-loader or whichever package manager you use.
You can use those renderers with either Astro live or build-time collections. I recommend using TailwindCSS's Typography plugin and wrapping the returned content component with a prose class.
Now you can use pckt.blog, leaflet.pub, or offprint.app as a CMS!
Check out my previous post for examples: https://chrisvanderloo.com/posts/a/3mkydjpwul723-offprint-as-an-astro-cms/