💥 Signals are now optional + reactive element

- `registerReactivity` can be used to register custom behavior
- Signals are automatically registered when `signals.js` is imported;
- `el("<>", signal, map)`

index.js

@@ -4,4 +4,3 @@
 });
 export * from "./src/dom.js";
 export * from "./src/events.js";
-export * from "./src/signals.js";