💥 rename signals to observables

docs_src/components/examples/observables/computations-abort.js

@@ -0,0 +1,16 @@
+import { O } from "deka-dom-el/observables";
+const observable= O(0);
+// computation pattern
+const double= O(()=> 2*observable());
+
+const ac= new AbortController();
+O.on(observable, v=> console.log("observable", v), { signal: ac.signal });
+O.on(double, v=> console.log("double", v), { signal: ac.signal });
+
+observable(observable()+1);
+const interval= 5000;
+const id= setInterval(()=> observable(observable()+1), interval);
+ac.signal.addEventListener("abort",
+	()=> setTimeout(()=> clearInterval(id), 2*interval));
+
+setTimeout(()=> ac.abort(), 3*interval)

docs_src/components/examples/observables/intro.js

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+// when NPM
+import { O } from "deka-dom-el/observables";
+// https://cdn.jsdelivr.net/gh/jaandrle/deka-dom-el/dist/esm-with-observables.js
+
+/**
+ * @type {ddeObservable}
+ * */
+/**
+ * @type {ddeActions}
+ * */

docs_src/components/examples/observables/observables.js

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+import { O } from "deka-dom-el/observables";
+// α — `observable` represents a reactive value
+const observable= O(0);
+// β — just reacts on observable changes
+O.on(observable, console.log);
+// γ — just updates the value
+observable(observable()+1);
+setInterval(()=> observable(observable()+1), 5000);