Set up API spec and basic components

frontend/src/components/Stats/Stats.module.scss

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+.wrapper {
+  display: flex;
+  justify-content: space-around;
+  align-items: flex-start;
+  flex-wrap: wrap;
+
+  & > div {
+    text-align: center;
+    padding: 0 6px;
+    min-width: 160px;
+    margin: 10px 0;
+  }
+}
+
+.number {
+  display: block;
+  font-weight: 900;
+  color: var(--secondary);
+  font-size: 2em;
+}
+
+.label {
+  display: block;
+}

frontend/src/components/Stats/Stats.tsx

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+import { API_BASE, StatsResponse } from '/src/config/api'
+import { useTranslation } from '/src/i18n/server'
+
+import styles from './Stats.module.scss'
+
+const getStats = async () => {
+  const res = await fetch(new URL('/stats', API_BASE))
+    .catch(console.warn)
+  if (!res?.ok) return
+  return StatsResponse.parse(await res.json())
+}
+
+const Stats = async () => {
+  const stats = await getStats()
+  const { t } = await useTranslation('home')
+
+  return <div className={styles.wrapper}>
+    <div>
+      <span className={styles.number}>
+        {new Intl.NumberFormat().format(stats?.event_count || 17000)}{!stats?.event_count && '+'}
+      </span>
+      <span className={styles.label}>{t('about.events')}</span>
+    </div>
+    <div>
+      <span className={styles.number}>
+        {new Intl.NumberFormat().format(stats?.person_count || 65000)}{!stats?.person_count && '+'}
+      </span>
+      <span className={styles.label}>{t('about.availabilities')}</span>
+    </div>
+  </div>
+}
+
+export default Stats