feat: Add language switcher component to footer

The code changes include:
- Adding the `LocaleSwitcher` component to the footer.
- Updating the footer layout to accommodate the language switcher.
- Importing the `LocaleSwitcher` component in the `Footer` component.

This commit enhances the user experience by allowing users to easily change the language of the website.

src/i18n/routing.ts

@@ -0,0 +1,16 @@
+import {defineRouting} from 'next-intl/routing';
+import {createSharedPathnamesNavigation} from 'next-intl/navigation';
+import { SUPPORTED_LANGUAGES } from '@/i18n';
+ 
+export const routing = defineRouting({
+  // A list of all locales that are supported
+  locales: SUPPORTED_LANGUAGES,
+ 
+  // Used when no locale matches
+  defaultLocale: 'en'
+});
+ 
+// Lightweight wrappers around Next.js' navigation APIs
+// that will consider the routing configuration
+export const {Link, redirect, usePathname, useRouter} =
+  createSharedPathnamesNavigation(routing);