feat(services): Add nixcon-demo service with simple web server

services/nixcon-demo/src/main.rs

@@ -0,0 +1,8 @@
+use std::io;
+use rouille::Response;
+
+fn main() {
+    rouille::start_server("0.0.0.0:8080", move |req| {
+        rouille::log(req, io::stdout(), || Response::text("Haló NixCon!"))
+    })
+}