add a setup landing page instead of creating a default admin account

commafeed-server/src/main/java/com/commafeed/security/CookieService.java

@@ -0,0 +1,24 @@
+package com.commafeed.security;
+
+import java.time.Instant;
+import java.util.Date;
+
+import jakarta.inject.Singleton;
+import jakarta.ws.rs.core.NewCookie;
+
+import io.quarkus.vertx.http.runtime.VertxHttpConfig;
+
+@Singleton
+public class CookieService {
+
+	private final String cookieName;
+
+	public CookieService(VertxHttpConfig config) {
+		this.cookieName = config.auth().form().cookieName();
+	}
+
+	public NewCookie buildLogoutCookie() {
+		return new NewCookie.Builder(cookieName).maxAge(0).expiry(Date.from(Instant.EPOCH)).path("/").build();
+	}
+
+}