fix: add nginx config for Jekyll clean URLs

Configure nginx to try .html extension for clean URLs like /music/shadow

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Co-Authored-By: Claude <noreply@anthropic.com>

nginx.conf

@@ -0,0 +1,23 @@
+server {
+    listen 80;
+    server_name _;
+    root /usr/share/nginx/html;
+    index index.html index.htm;
+
+    # Jekyll clean URLs - try .html extension
+    location / {
+        try_files $uri $uri.html $uri/ =404;
+    }
+
+    # Handle 404 errors
+    error_page 404 /404.html;
+    location = /404.html {
+        internal;
+    }
+
+    # Handle server errors
+    error_page 500 502 503 504 /50x.html;
+    location = /50x.html {
+        internal;
+    }
+}