docs mainly signals

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

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

docs_src/components/examples/signals/intro.js

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