Update NOTICE to only include direct software being used, update README copyright (opensearch-project#8)

Signed-off-by: Tyler Ohlsen <ohltyler@amazon.com>

Author: ohltyler

NOTICE.txt

@@ -1,12 +1,2 @@
-OpenSearch
+OpenSearch Anomaly Detection Dashboards
 Copyright 2021 OpenSearch Contributors
-
-This product includes software developed by
-Elasticsearch (http://www.elastic.co).
-Copyright 2009-2018 Elasticsearch
-
-This product includes software developed by The Apache Software
-Foundation (http://www.apache.org/).
-
-This product includes software developed by
-Joda.org (http://www.joda.org/).

README.md

@@ -78,22 +78,22 @@ In the base OpenSearch Dashboards directory, run
 
 ## Contributing
 
-We welcome you to get involved in development, documentation, testing the anomaly detection plugin. See our [CONTRIBUTING.md](./CONTRIBUTING.md) and join in.
+We welcome you to get involved in development, documentation, testing the anomaly detection plugin. See our [CONTRIBUTING.md](CONTRIBUTING.md) and join in.
 
 Since this is a OpenSearch Dashboards plugin, it can be useful to review the [OpenSearch Dashboards contributing guide](https://github.com/opensearch-project/OpenSearch-Dashboards/blob/main/CONTRIBUTING.md) as well as the [developer guide](https://github.com/opensearch-project/OpenSearch-Dashboards/blob/main/DEVELOPER_GUIDE.md) to help get started.
 
 ## Code of Conduct
 
-This project has adopted an [Open Source Code of Conduct](https://opendistro.github.io/for-elasticsearch/codeofconduct.html).
+This project has adopted an [Open Source Code of Conduct](CODE_OF_CONDUCT.md).
 
 ## Security issue notifications
 
 If you discover a potential security issue in this project we ask that you notify AWS/Amazon Security via our [vulnerability reporting page](http://aws.amazon.com/security/vulnerability-reporting/). Please do **not** create a public GitHub issue.
 
 ## License
 
-See the [LICENSE](./LICENSE.txt) file for our project's licensing. We will ask you to confirm the licensing of your contribution.
+See the [LICENSE](LICENSE.txt) file for our project's licensing. We will ask you to confirm the licensing of your contribution.
 
 ## Copyright
 
-Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+Copyright 2021 OpenSearch Contributors