Thanks for the awesome feed page and congratulations on launching into the IndieWeb in 2019!
If it helps, Max Böck recently wrote some excellent articles (with code examples) on using Eleventy to easily syndicate content to Twitter as well as to add Webmention functionality. If you haven’t seen them yet, they may help you along your journey a bit more quickly. Both can be found at: https://indieweb.org/Eleventy
How to pull interactions from social media platforms like Twitter back to your own site, using Webmentions, webmention.io and Bridgy.
Clear and lucid tutorial for adding Webmention to one’s Eleventy-based static site.
How to automatically publish content from a static site on Twitter, using Eleventy and Netlify's lambda functions.
A nice little article with some excellent code examples for those who want to follow along.