feat: add basic k6 load testing script

misc/k6/README.md

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+# K6 - Load Test
+
+Very basic load testing script for [k6](https://k6.io/).
+
+## How to run
+
+```shell
+k6 run cadoles-loadtest.js
+```

misc/k6/cadoles-loadtest.js

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+import { check } from 'k6';
+import { browser } from 'k6/experimental/browser';
+
+export const options = {
+  scenarios: {
+    browser: {
+      vus: 10,
+      iterations: 100,
+      executor: 'shared-iterations',
+      options: {
+        browser: {
+          type: 'chromium',
+        },
+      },
+    },
+  }
+};
+
+export default async function () {
+  const page = browser.newPage();
+  try {
+    await page.goto('https://www.cadoles.com');
+    check(page, {
+      'Homepage loaded': p => p.locator('h1').textContent().trim() == 'La liberté est un choix',
+    });
+  } finally {
+    page.close();
+  }
+}