fixes: fix dark scheme & port from legacy blog

My old blog only ever had 1 post, but its a good place to start.

astro.config.mjs

@@ -21,7 +21,7 @@ export default /** @type {import('astro').AstroUserConfig} */ ({
   // outDir: './dist',       // When running `astro build`, path to final static output
   // publicDir: './public',   // A folder of static files Astro will copy to the root. Useful for favicons, images, and other files that don’t need processing.
 
-  site: 'https://astro-ink.vercel.app', // Your public domain, e.g.: https://my-site.dev/. Used to generate sitemaps and canonical URLs.
+  site: 'https://nrd.sh',
   server: {
     // port: 3000,         // The port to run the dev server on.
   },