feat: remove appwrite and add nextjs backend

frontend/src/pages/auth/signIn.tsx

@@ -0,0 +1,20 @@
+import { useRouter } from "next/router";
+import AuthForm from "../../components/auth/AuthForm";
+import Meta from "../../components/Meta";
+import useUser from "../../hooks/user.hook";
+
+const SignIn = () => {
+  const user = useUser();
+  const router = useRouter();
+  if (user) {
+    router.replace("/");
+  } else {
+    return (
+      <>
+        <Meta title="Sign In" />
+        <AuthForm mode="signIn" />
+      </>
+    );
+  }
+};
+export default SignIn;

frontend/src/pages/auth/signUp.tsx

@@ -0,0 +1,22 @@
+import { useRouter } from "next/router";
+import AuthForm from "../../components/auth/AuthForm";
+import Meta from "../../components/Meta";
+import useUser from "../../hooks/user.hook";
+
+const SignUp = () => {
+  const user = useUser();
+  const router = useRouter();
+  if (user) {
+    router.replace("/");
+  } else if (process.env.NEXT_PUBLIC_DISABLE_REGISTRATION) {
+    router.replace("/auth/signIn");
+  } else {
+    return (
+      <>
+        <Meta title="Sign Up" />
+        <AuthForm mode="signUp" />
+      </>
+    );
+  }
+};
+export default SignUp;