feat: update readme

Author: savonarola

README.md

@@ -5,7 +5,7 @@
 Download the plugin:
 
 ```bash
-wget https://github.com/savonarola/emqx-offline-message-plugin/releases/download/v0.0.4/emqx_offline_message_plugin-1.0.0.tar.gz
+wget https://github.com/savonarola/emqx-offline-message-plugin/releases/download/v0.0.7/emqx_offline_message_plugin-1.0.0.tar.gz
 ```
 
 Install the plugin:
@@ -22,46 +22,7 @@ Check the plugin is installed:
 curl -u key:secret http://localhost:18083/api/v5/plugins | jq
 ```
 
-Add connector:
-
-```bash
-curl -u key:secret -X POST http://localhost:18083/api/v5/connectors \
--H "Content-Type: application/json" \
--d '{"type":"mysql","name":"omp","server":"mysql","database":"emqx","pool_size":8,"username":"emqx","password":"public","resource_opts":{"start_timeout":"5s","health_check_interval":"15s"}}'
-
-curl -s -u key:secret http://localhost:18083/api/v5/connectors | jq
-```
-
-Add publish action:
-
-```bash
-curl -u key:secret -X POST http://localhost:18083/api/v5/actions \
--H "Content-Type: application/json" \
--d '{"type":"mysql","parameters":{"undefined_vars_as_null":false,"sql":"insert into mqtt_msg(msgid, sender, topic, qos, retain, payload, arrived) values(${id}, ${clientid}, ${topic}, ${qos}, ${retain}, ${payload}, FROM_UNIXTIME(${timestamp}/1000))"},"name":"omp_publish_action","enable":true,"connector":"omp"}'
-
-curl -s -u key:secret http://localhost:18083/api/v5/actions | jq
-```
-
-Add publish rule:
-
-```bash
-curl -u key:secret -X POST http://localhost:18083/api/v5/rules \
--H "Content-Type: application/json" \
--d '{"sql":"SELECT id, clientid, topic, qos, payload, timestamp, int(coalesce(flags.retain, 0)) as retain FROM \"t/#\" WHERE qos = 1 or qos = 2","name":"omp_publish_rule","description":"Offline Message Plugin Publish Action","actions":["mysql:omp_publish_action"]}'
-
-curl -s -u key:secret http://localhost:18083/api/v5/rules | jq
-```
-
-Add subscribe/ack rule.
-This the only configuration change that is unavailable from the Dashboard.
-
-```bash
-curl -u key:secret -X POST http://localhost:18083/api/v5/rules \
--H "Content-Type: application/json" \
--d '{"sql":"SELECT * FROM \"$events/session_subscribed\", \"$events/message_acked\" WHERE topic =~ '"'"'t/#'"'"'","name":"omp_subscribe_ack_rule","description":"Offline Message Plugin Subscribe/Ack Action","actions":[{"function":"emqx_omp:action","args":{"opts":{},"connector_name":"mysql:omp"}}]}'
-
-curl -s -u key:secret http://localhost:18083/api/v5/rules | jq
-```
+Configure the plugin in the Dashboard: http://localhost:18083/#/plugins/detail/emqx_offline_message_plugin-1.0.0
 
 Verify: