Add LFX Insights health badge and revamp badges (#18785) (#18823)

This is pretty subjective, but I think we can reduce the number of
badges shown at the top of the README. I've removed the links to the
docs and forum as those links are available below in the project
resources section. The issue count and PR count are visible at the top
of the page on the default GitHub UI. The various gradle check statuses
also didn't seem particularly useful in my opinion.


(cherry picked from commit 315f26d)

Signed-off-by: Andrew Ross <[email protected]>

Author: andrross

README.md

@@ -1,12 +1,10 @@
 <img src="https://opensearch.org/assets/img/opensearch-logo-themed.svg" height="64px">
 
-[![Chat](https://img.shields.io/badge/chat-on%20forums-blue)](https://forum.opensearch.org/c/opensearch/)
-[![Documentation](https://img.shields.io/badge/documentation-reference-blue)](https://opensearch.org/docs/latest/opensearch/index/)
-[![codecov](https://codecov.io/gh/opensearch-project/OpenSearch/branch/2.x/graph/badge.svg)](https://codecov.io/gh/opensearch-project/OpenSearch)
-[![GHA gradle check](https://github.com/opensearch-project/OpenSearch/actions/workflows/gradle-check.yml/badge.svg)](https://github.com/opensearch-project/OpenSearch/actions/workflows/gradle-check.yml)
-[![GHA validate pull request](https://github.com/opensearch-project/OpenSearch/actions/workflows/wrapper.yml/badge.svg)](https://github.com/opensearch-project/OpenSearch/actions/workflows/wrapper.yml)
-[![GHA precommit](https://github.com/opensearch-project/OpenSearch/actions/workflows/precommit.yml/badge.svg)](https://github.com/opensearch-project/OpenSearch/actions/workflows/precommit.yml)
-[![Jenkins gradle check job](https://img.shields.io/jenkins/build?jobUrl=https%3A%2F%2Fbuild.ci.opensearch.org%2Fjob%2Fgradle-check%2F&label=Jenkins%20Gradle%20Check)](https://build.ci.opensearch.org/job/gradle-check/)
+[![LFX Health Score](https://insights.production.lfx.dev/api/badge/health-score?project=opensearch-foundation)](https://insights.linuxfoundation.org/project/opensearch-foundation)
+[![LFX Active Contributors](https://insights.production.lfx.dev/api/badge/active-contributors?project=opensearch-foundation&repos=https://github.com/opensearch-project/OpenSearch)](https://insights.linuxfoundation.org/project/opensearch-foundation/repository/opensearch-project-opensearch)
+[![Code Coverage](https://codecov.io/gh/opensearch-project/OpenSearch/branch/main/graph/badge.svg)](https://codecov.io/gh/opensearch-project/OpenSearch)
+![GitHub release (latest SemVer)](https://img.shields.io/github/v/release/opensearch-project/OpenSearch?sort=semver)
+
 
 
 - [Welcome!](#welcome)
@@ -24,10 +22,9 @@
 ## Project Resources
 
 * [Project Website](https://opensearch.org/)
-* [Downloads](https://opensearch.org/downloads.html)
-* [Documentation](https://opensearch.org/docs/)
-* Need help? Try [Forums](https://discuss.opendistrocommunity.dev/)
-* [Project Principles](https://opensearch.org/#principles)
+* [Downloads](https://opensearch.org/downloads/)
+* [Documentation](https://docs.opensearch.org/)
+* Need help? Try [Forums](https://discuss.opendistrocommunity.dev/) or [Slack](https://opensearch.org/slack/)
 * [Contributing to OpenSearch](CONTRIBUTING.md)
 * [Maintainer Responsibilities](MAINTAINERS.md)
 * [Release Management](RELEASING.md)