Update readme and more GitHub pages setup (#869)

* Update readme with the published website link and more GitHub pages setup

Signed-off-by: Fanit Kolchina <[email protected]>

* Move favicon to assets

Signed-off-by: Fanit Kolchina <[email protected]>

---------

Signed-off-by: Fanit Kolchina <[email protected]>

Author: kolchfa-aws

README.md

@@ -14,6 +14,8 @@
   * [Maintainers](#maintainers)
   * [Code of Conduct](#code-of-conduct)
 
+To view extension documentation as a webpage, go to [https://opensearch-project.github.io/opensearch-sdk-java/](https://opensearch-project.github.io/opensearch-sdk-java/).
+
 ## Introduction
 With OpenSearch plugins, you can extend and enhance various core features. However, the current plugin architecture may fatally impact clusters in the event of failure. To ensure that plugins run safely without impacting the system, our goal is to isolate plugin interactions with OpenSearch. The OpenSearch SDK for Java modularizes the [extension points](https://opensearch.org/blog/technical-post/2021/12/plugins-intro/) onto which plugins hook.
 

_config.yml

@@ -2,6 +2,7 @@ title: OpenSearch SDK for Java
 description: Extension Documentation
 theme: jekyll-theme-minimal
 logo: /assets/img/logo.png
+include: CONTRIBUTING.md
 
 sidenav:
   - name: Design

_includes/head_custom.html

@@ -4,6 +4,6 @@
 <!-- {% include head-custom-google-analytics.html %} -->
 
 <!-- You can set your favicon here -->
-<link rel="shortcut icon" type="image/ico" href="{{ /assets/img/logo.png | relative_url }}" >
+<link rel="shortcut icon" type="image/ico" href="{{ /assets/img/favicon.ico | relative_url }}" >
 
 <!-- end custom head snippets -->