clean up remaining NEXT_PUBLIC_ environment variables

next.config.ts

@@ -12,21 +12,6 @@ import "./lib/env";
 const nextConfig: NextConfig = {
   reactStrictMode: true,
   productionBrowserSourceMaps: true,
-  env: {
-    // same logic as metadataBase: https://nextjs.org/docs/app/api-reference/functions/generate-metadata#default-value
-    NEXT_PUBLIC_BASE_URL:
-      process.env.VERCEL_ENV === "production" && process.env.VERCEL_PROJECT_PRODUCTION_URL
-        ? `https://${process.env.VERCEL_PROJECT_PRODUCTION_URL}`
-        : process.env.VERCEL_ENV === "preview" && process.env.VERCEL_BRANCH_URL
-          ? `https://${process.env.VERCEL_BRANCH_URL}`
-          : process.env.VERCEL_URL
-            ? `https://${process.env.VERCEL_URL}`
-            : `http://localhost:${process.env.PORT || 3000}`,
-
-    // freeze timestamp at build time for when server-side pages need a "last updated" date. calling Date.now() from
-    // pages using getServerSideProps will return the current(ish) time instead, which is usually not what we want.
-    NEXT_PUBLIC_RELEASE_TIMESTAMP: new Date().toISOString(),
-  },
   pageExtensions: ["js", "jsx", "ts", "tsx", "md", "mdx"],
   outputFileTracingIncludes: {
     "/notes/[slug]/opengraph-image": [