reworked slider + added coaches page

src/i18n/utils.ts

@@ -1,4 +1,4 @@
-import { ui } from './ui'
+import { ui, type TranslationKey } from './ui'
 
 import { i18n } from 'astro:config/client'
 
@@ -11,7 +11,7 @@ export function getLangFromUrl(url: URL) {
 }
 
 export function useTranslations(lang?: string) {
-  return function t(key: keyof (typeof ui)[keyof typeof ui]) {
+  return function t(key: TranslationKey) {
     return ui[lang as keyof typeof ui]?.[key] || ui[i18n!.defaultLocale as keyof typeof ui][key]
   }
 }