fix: SEO canonical URLs, LCP performance, remove unused dependencies

- Remove duplicate app/projects/ route (was causing 5xx and soft 404)
- Fix nginx: redirect www.dk0.dev → dk0.dev (non-www canonical)
- Fix not-found.tsx: locale-prefixed links, remove framer-motion dependency
- Add fetchPriority='high' and will-change to Hero LCP image
- Add preconnect hints for hardcover.app and cms.dk0.dev
- Reduce background blur from 100px to 80px (LCP rendering delay)
- Remove boneyard-js (~20 KiB), replace with custom Skeleton component
- Remove react-icons (~10 KiB), replace with inline SVGs
- Conditionally render mobile menu (saves ~20 DOM nodes)
- Add /books to sitemap
- Optimize image config with explicit deviceSizes/imageSizes

nginx.production.conf

@@ -52,17 +52,34 @@ http {
         server portfolio:3000 max_fails=3 fail_timeout=30s;
     }
 
-    # HTTP Server (redirect to HTTPS)
+    # HTTP Server (redirect to HTTPS with www → non-www)
     server {
         listen 80;
-        server_name dk0.dev www.dk0.dev;
-        return 301 https://$host$request_uri;
+        server_name www.dk0.dev;
+        return 301 https://dk0.dev$request_uri;
+    }
+
+    server {
+        listen 80;
+        server_name dk0.dev;
+        return 301 https://dk0.dev$request_uri;
+    }
+
+    # HTTPS - redirect www to non-www
+    server {
+        listen 443 ssl http2;
+        server_name www.dk0.dev;
+
+        ssl_certificate /etc/nginx/ssl/cert.pem;
+        ssl_certificate_key /etc/nginx/ssl/key.pem;
+
+        return 301 https://dk0.dev$request_uri;
     }
 
     # HTTPS Server
     server {
         listen 443 ssl http2;
-        server_name dk0.dev www.dk0.dev;
+        server_name dk0.dev;
 
         # SSL Configuration
         ssl_certificate /etc/nginx/ssl/cert.pem;