Define a hash url for each example automaton

src/main.js

@@ -21,6 +21,7 @@ for (const [displayName, automaton] of Object.entries(AUTOMATONS)) {
   const handleEvent = () => {
     automatonSelector.setAttribute('hidden', 'hidden');
     app.removeAttribute('hidden');
+    history.replaceState({ automaton }, '', `#${encodeURIComponent(displayName)}`);
     openAutomaton(trUserContent(displayName), automaton);
   };
   card.addEventListener('click', handleEvent);
@@ -46,7 +47,15 @@ create.addEventListener('click', () => {
   openAutomaton('', [], true);
 });
 
+const hash = decodeURIComponent(location.hash.slice(1));
+if (AUTOMATONS.hasOwnProperty(hash)) {
+  openAutomaton(trUserContent(hash), AUTOMATONS[/** @type {keyof typeof AUTOMATONS} */ (hash)]);
+  automatonSelector.setAttribute('hidden', 'hidden');
+  app.removeAttribute('hidden');
+}
+
 backButton.addEventListener('click', () => {
   app.setAttribute('hidden', 'hidden');
   automatonSelector.removeAttribute('hidden');
+  history.replaceState({}, '', '#');
 });