[FLINK-36289][Connectors/Prometheus][docs] Integrate Prometheus connector docs into Flink website

Author: hlteoh37

docs/content.zh/docs/connectors/datastream/overview.md

@@ -53,6 +53,7 @@ Currently these systems are supported as part of the Apache Flink project:
  * [Apache Pulsar]({{< ref "docs/connectors/datastream/pulsar" >}}) (source)
  * [JDBC]({{< ref "docs/connectors/datastream/jdbc" >}}) (sink)
  * [MongoDB]({{< ref "docs/connectors/datastream/mongodb" >}}) (source/sink)
+ * [Prometheus]({{< ref "docs/connectors/datastream/prometheus" >}}) (sink)
 
 请记住，在使用一种连接器时，通常需要额外的第三方组件，比如：数据存储服务器或者消息队列。
 要注意这些列举的连接器是 Flink 工程的一部分，包含在发布的源码中，但是不包含在二进制发行版中。

docs/content/docs/connectors/datastream/overview.md

@@ -54,6 +54,7 @@ Currently these systems are supported as part of the Apache Flink project:
  * [Apache Pulsar]({{< ref "docs/connectors/datastream/pulsar" >}}) (source)
  * [JDBC]({{< ref "docs/connectors/datastream/jdbc" >}}) (sink)
  * [MongoDB]({{< ref "docs/connectors/datastream/mongodb" >}}) (source/sink)
+ * [Prometheus]({{< ref "docs/connectors/datastream/prometheus" >}}) (sink)
 
 Keep in mind that to use one of these connectors in an application, additional third party
 components are usually required, e.g. servers for the data stores or message queues.

docs/setup_docs.sh

@@ -62,6 +62,7 @@ if [ "$SKIP_INTEGRATE_CONNECTOR_DOCS" = false ]; then
   integrate_connector_docs opensearch v1.2
   integrate_connector_docs kafka v3.3
   integrate_connector_docs hbase v3.0
+  integrate_connector_docs prometheus v1.0
 
   cd ..
   rm -rf tmp