refactor(javascript,assets): rename js directory to javascript

assets/javascript/entry.js

@@ -0,0 +1,3 @@
+import * as hello from './hello.js';
+
+hello.hello();

assets/javascript/hello.js

@@ -0,0 +1,6 @@
+/**
+ * Says hello!
+ */
+export function hello() {
+	console.log('hello world');
+}

assets/javascript/pages/devcolors.js

@@ -0,0 +1,7 @@
+document.querySelector('#accent-color-hue').addEventListener('change', (e) => {
+	// eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
+	const hue = /** @type {number} */ (e.target?.value);
+
+	document.querySelector('body')
+		.setAttribute('style', `--user-theme-accent-hue:${String(hue)};`);
+});