Self-host hero slider images instead of hotlinking to Unsplash

Production server has no path to fetch images.unsplash.com at
request time, so the slider was rendering without backgrounds
after deploy. Downloaded and cropped the same 3 photos locally
into public/images/ (landscape, ~1920px, ~450-730KB each) and
point the slider at them; dropped the now-unused Unsplash
remotePattern from next.config.ts.

next.config.ts

@@ -3,10 +3,6 @@ import type { NextConfig } from "next";
 const nextConfig: NextConfig = {
   images: {
     remotePatterns: [
-      {
-        protocol: "https",
-        hostname: "images.unsplash.com",
-      },
       {
         protocol: "https",
         hostname: "c804387.parspack.net",