Remove io_uring incubator in Vert.x 5

Author: vietj

.github/workflows/ci-5.x.yml

@@ -0,0 +1,45 @@
+= Vert.x io_uring Incubator
+
+image:https://github.com/vert-x3/vertx-io_uring-incubator/actions/workflows/ci-4.x.yml/badge.svg[Build Status (4.x),link=https://github.com/vert-x3/vertx-io_uring-incubator/actions/workflows/ci-4.x.yml]
+
+NOTE: io_uring is supported by Vert.x Core since Vert.x 5, this library is an incubator for Vert.x 4.x
+
+Vert.x io_uring is a transport using the io_uring interface of the Linux kernel.
+
+Vert.x io_uring works with
+
+* https://vertx.io/docs/vertx-core/java/[Vert.x Core] TCP, HTTP, datagram servers/clients
+* https://vertx.io/docs/vertx-grpc/java/[Vert.x gRPC]
+* https://vertx.io/docs/vertx-pg-client/java/[PostgeSQL], https://vertx.io/docs/vertx-mysql-client/java/[MySQL], https://vertx.io/docs/vertx-mssql-client/java/[MSSQL] and https://vertx.io/docs/vertx-db2-client/java/[DB2] reactive clients
+* https://vertx.io/docs/vertx-redis-client/java/[Redis] client
+* https://vertx.io/docs/vertx-mqtt/java/[Vert.x MQTT]
+* https://vertx.io/docs/vertx-amqp-client/java/[Vert.x AMQP] client
+* https://vertx.io/docs/vertx-stomp/java/[Vert.x STOMP]
+* https://vertx.io/docs/vertx-http-proxy/java/[Vert.x HTTP Proxy]
+* https://vertx.io/docs/vertx-mail-client/java/[Vert.x Mail]
+* https://vertx.io/docs/vertx-consul-client/java/[Vert.x Consul] client
+
+WARNING: This module has _incubation_ status and only works on some Linux OSes.
+
+== Prerequisites
+
+* https://vertx.io/docs/4.5.0[Vert.x 4.5.0]
+
+== Usage
+
+Snapshots are available at s01.oss.sonatype.org
+
+[source,xml]
+----
+<repository>
+  <id>sonatype-nexus-snapshots</id>
+  <url>https://s01.oss.sonatype.org/content/repositories/snapshots</url>
+  <snapshots>
+    <enabled>true</enabled>
+  </snapshots>
+  <layout>default</layout>
+  <releases>
+    <enabled>false</enabled>
+  </releases>
+</repository>
+----