chore: embed nginx config in Dockerfile

nginx.conf

@@ -0,0 +1,27 @@
+server {
+    listen 80;
+
+    location / {
+        root /usr/share/nginx/html;
+        index index.html index.htm;
+        try_files $uri $uri.html $uri/index.html $uri/index.htm $uri/ =404;
+    }
+
+    location /.well-known/ {
+        root /usr/share/nginx/html;
+        add_header Access-Control-Allow-Origin *;
+        add_header Access-Control-Allow-Methods "GET, OPTIONS";
+    }
+
+    error_page 404 /404.html;
+    location = /404.html {
+        root /usr/share/nginx/html;
+        internal;
+    }
+
+    error_page 500 502 503 504 /50x.html;
+    location = /50x.html {
+        root /usr/share/nginx/html;
+        internal;
+    }
+}