fix user signup disabled env could be set to anything to disable signup

apps/web/pages/api/public/users/index.tsx

@@ -9,7 +9,7 @@ export default async function handle(req: NextApiRequest, res: NextApiResponse)
   // Required fields in body: email, password (hashed)
   // Optional fields in body: firstname, lastname
   if (req.method === "POST") {
-    if (process.env.NEXT_PUBLIC_SIGNUP_DISABLED) {
+    if (process.env.NEXT_PUBLIC_SIGNUP_DISABLED === "1") {
       res.status(403).json({ error: "Signup disabled" });
       return;
     }

apps/web/pages/auth/signin.tsx

@@ -95,7 +95,7 @@ export default function SignInPage() {
                         </Link>
                       )}
 
-                      {!process.env.NEXT_PUBLIC_SIGNUP_DISABLED && (
+                      {process.env.NEXT_PUBLIC_SIGNUP_DISABLED !== "1" && (
                         <Link href="/auth/signup">
                           <a href="" className="text-red text-xs hover:text-red-600">
                             Create an account

apps/web/pages/auth/signup.tsx

@@ -32,7 +32,7 @@ export default function SignUpPage() {
   };
   return (
     <BaseLayoutUnauthorized title="Sign up">
-      {process.env.NEXT_PUBLIC_SIGNUP_DISABLED ? (
+      {process.env.NEXT_PUBLIC_SIGNUP_DISABLED === "1" ? (
         <div className="bg-ui-gray-light flex min-h-screen">
           <div className="mx-auto flex flex-1 flex-col justify-center px-4 py-12 sm:px-6 lg:flex-none lg:px-20 xl:px-24">
             <div className="shadow-cont mx-auto w-full max-w-sm rounded-xl bg-white p-8 lg:w-96">