Merge addons

docs/learn/concepts/addons.md

@@ -1,15 +1,23 @@
 # Addons
-A collection of third-party jecs assets made by the community. If you would like to share what you're working on, [submit a pull request](https://github.com/Ukendio/jecs)!
+
+A collection of third-party jecs addons made by the community. If you would like to share what you're working on, [submit a pull request](https://github.com/Ukendio/jecs)!
+
+# Debuggers
 
 ## [jabby](https://github.com/alicesaidhi/jabby)
+
 A jecs debugger with a string-based query language and entity editing capabilities.
 
 # Schedulers
+
 ## [lockstep scheduler](https://gist.github.com/1Axen/6d4f78b3454cf455e93794505588354b)
+
 A simple fixed step system scheduler.
 
-## [sapphire-jecs](https://github.com/Mark-Marks/sapphire/tree/main/crates/sapphire-jecs)
-A batteries-included [sapphire](https://github.com/mark-marks/sapphire) scheduler for jecs
+## [rubine](https://github.com/Mark-Marks/rubine)
+
+An ergonomic, runtime agnostic scheduler for Jecs
 
 ## [jam](https://github.com/revvy02/Jam)
+
 Provides hooks and a scheduler that implements jabby and a topographical runtime