[feature][website] release notes for pulsar manager 0.3.0 (apache#15772)

site2/.gitignore

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 website-tmp*/
 
-.preview/
+.preview/
+brodocs/

site2/website/pulsar-manager-release-notes.md

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 ## Apache Pulsar Manager
 
+### 0.3.0 &mdash; 2022-05-25 <a id="0.3.0"></a>
+* Fix MySQL schema field token error [PR-339](https://github.com/apache/pulsar-manager/pull/339)
+* Fix the bugs in topics list page and search topics [PR-342](https://github.com/apache/pulsar-manager/pull/342)
+* Fix the issue of Swagger does not work [PR-369](https://github.com/apache/pulsar-manager/pull/369)
+* Add offload threshold input [PR-375](https://github.com/apache/pulsar-manager/pull/375)
+* Add dashboard service for aggregated information collection [PR-326](https://github.com/apache/pulsar-manager/pull/326)
+* Add multi bookie cluster support [PR-388](https://github.com/apache/pulsar-manager/pull/388)
+* Fix the bug that admin roles cannot be deleted [PR-397](https://github.com/apache/pulsar-manager/pull/397)
+* Add Filtering support for tenant/namespace/topic [PR-440](https://github.com/apache/pulsar-manager/pull/440)
+* Fix Log4J security vulnerabilities [PR-438](https://github.com/apache/pulsar-manager/pull/438)
+* Allow user to assign tenant as resource to role [PR-436](https://github.com/apache/pulsar-manager/pull/436)
+* Add support for Casdoor [PR-446](https://github.com/apache/pulsar-manager/pull/446)
+* Fix unload namespace error [PR-386](https://github.com/apache/pulsar-manager/pull/386)
+
 ### 0.2.0 &mdash; 2020-09-28 <a id="0.2.0"></a>
 
 * Support multiple addresses for the broker stats [PR-306](https://github.com/apache/pulsar-manager/pull/306).

site2/website/pulsar-manager-release.json

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 [
+  "0.3.0",
   "0.2.0",
   "0.1.0"
 ]