⚡ Replace “observable” term with “signal” (#19)

* ⚡ refact docs

to make editing (now renaming observables to signal) easier

* ⚡ ⚡ use signal(s) term isntead of observable(s)

* ⚡ 🔤 version + typo

* 🐛 customElement example (0→S)

* 📺 version in package-lock.json

docs_src/components/examples/customElement/intro.js

@@ -1,12 +1,12 @@
-// use NPM or for example https://cdn.jsdelivr.net/gh/jaandrle/deka-dom-el/dist/esm-with-observables.js
+// use NPM or for example https://cdn.jsdelivr.net/gh/jaandrle/deka-dom-el/dist/esm-with-signals.js
 import {
 	customElementRender,
 	customElementWithDDE,
 	observedAttributes,
 } from "deka-dom-el";
 /** @type {ddePublicElementTagNameMap} */
-import { O } from "deka-dom-el/observables";
-O.observedAttributes;
+import { S } from "deka-dom-el/signals";
+S.observedAttributes;
 
 // “internal” utils
 import { lifecyclesToEvents } from "deka-dom-el";