add default server ngx config

ngx/.gitignore

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+/out

ngx/build.sh

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+#!/usr/bin/env bash
+
+mkdir out 2>/dev/null || true
+deno run ./default.ts > out/default.conf

ngx/default.ts

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+import ngx from "jsr:@char/ngx@0.2";
+
+export const config = ngx("server", [
+  [
+    "listen 80 default_server",
+    "listen [::]:80 default_server"
+  ],
+  ngx("location '/.well-known/acme-challenge'", ["root /srv/www/acme"]),
+  ngx("location /", ["return 302 https://$host$request_uri"]),
+]);
+
+if (import.meta.main) console.log(config.build());

www/acme/.gitignore

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+*
+!/.gitignore