feat: remove appwrite and add nextjs backend

frontend/src/pages/api/[...all].tsx

@@ -0,0 +1,19 @@
+import { NextApiRequest, NextApiResponse } from "next";
+import httpProxyMiddleware from "next-http-proxy-middleware";
+import getConfig from "next/config";
+
+const { publicRuntimeConfig } = getConfig();
+
+export const config = {
+  api: {
+    bodyParser: false,
+    externalResolver: true,
+  },
+};
+
+// This function can be marked `async` if using `await` inside
+export default (req: NextApiRequest, res: NextApiResponse) =>
+  httpProxyMiddleware(req, res, {
+    // You can use the `http-proxy` option
+    target: publicRuntimeConfig.BACKEND_URL,
+  });