add toc to fediverse post

src/posts/2026/2026-09-28-fediverse.md

@@ -1,5 +1,6 @@
 ---
 title: intro to the fediverse
+layout: post-with-toc.njk
 image:
   src: 2026/madrone-bark.jpg
   alt: "Image unrelated to post. A close up shot of the curling, shedding bark of the madrone tree. The shedding bark is a beautiful rusty brown, and the tree underneath light green."