refactor!: serve the static frontend trough the backend (#520)

Co-authored-by: Alessandro (Ale) Segala <43508+ItalyPaleAle@users.noreply.github.com>

frontend/src/hooks.ts

@@ -0,0 +1,31 @@
+import { paraglideMiddleware } from '$lib/paraglide/server';
+import type { Handle, HandleServerError } from '@sveltejs/kit';
+import { AxiosError } from 'axios';
+
+// Handle to use the paraglide middleware
+const paraglideHandle: Handle = ({ event, resolve }) => {
+	return paraglideMiddleware(event.request, ({ locale }) => {
+		return resolve(event, {
+			transformPageChunk: ({ html }) => html.replace('%lang%', locale)
+		});
+	});
+};
+
+export const handle: Handle = paraglideHandle;
+
+export const handleError: HandleServerError = async ({ error, message, status }) => {
+	if (error instanceof AxiosError) {
+		message = error.response?.data.error || message;
+		status = error.response?.status || status;
+		console.error(
+			`Axios error: ${error.request.path} - ${error.response?.data.error ?? error.message}`
+		);
+	} else {
+		console.error(error);
+	}
+
+	return {
+		message,
+		status
+	};
+};