add example nginx config file

contrib/nginx/README.md

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+# nginx configuration
+
+## Insert wasm type into nginx mime.types file so they load correctly.
+
+`/etc/nginx/mime.types`:
+```
+..
+    application/wasm                      wasm;
+..
+```

contrib/nginx/cinny.domain.tld.conf

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+server {
+	listen 80;
+	listen [::]:80;
+	server_name cinny.domain.tld;
+
+	location / {
+		return 301 https://$host$request_uri;
+	}
+
+	location /.well-known/acme-challenge/ {
+		alias /var/lib/letsencrypt/.well-known/acme-challenge/;
+	}
+}
+
+server {
+	listen 443 ssl http2;
+	listen [::]:443 ssl;
+	server_name cinny.domain.tld;
+
+	location / {
+		root /opt/cinny/dist/;
+		index index.html;
+	}
+	location ~* ^\/(login|register) {
+		try_files $uri $uri/ /index.html;
+	}
+}