feat: migrate nextjs to rr7

apps/remix/app/storage/theme-session.server.ts

@@ -0,0 +1,20 @@
+import { createCookieSessionStorage } from 'react-router';
+import { createThemeSessionResolver } from 'remix-themes';
+
+import { NEXT_PUBLIC_WEBAPP_URL } from '@documenso/lib/constants/app';
+import { env } from '@documenso/lib/utils/env';
+
+const themeSessionStorage = createCookieSessionStorage({
+  cookie: {
+    name: 'theme',
+    path: '/',
+    httpOnly: true,
+    sameSite: 'lax',
+    secrets: ['insecure-secret'], // Todo: Don't need secret
+    // Todo: Check this works on production.
+    // Set domain and secure only if in production
+    ...(env('NODE_ENV') === 'production' ? { domain: NEXT_PUBLIC_WEBAPP_URL(), secure: true } : {}),
+  },
+});
+
+export const themeSessionResolver = createThemeSessionResolver(themeSessionStorage);