update changelog

Author: jonhealy1

CHANGELOG.md

@@ -12,6 +12,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - use index templates for Collection and Item indices [#208](https://github.com/stac-utils/stac-fastapi-elasticsearch-opensearch/discussions/208)
 - Added API `title`, `version`, and `description` parameters from environment variables `STAC_FASTAPI_TITLE`, `STAC_FASTAPI_VERSION` and `STAC_FASTAPI_DESCRIPTION`, respectively. [#207](https://github.com/stac-utils/stac-fastapi-elasticsearch-opensearch/pull/207)
 - Added a `STAC_FASTAPI_ROOT_PATH` environment variable to define the root path. Useful when working with an API gateway or load balancer. [#221](https://github.com/stac-utils/stac-fastapi-elasticsearch-opensearch/pull/221)
+- Added mkdocs, pdocs, to generate docs and push to gh pages via workflow. Updated documentation. [#223](https://github.com/stac-utils/stac-fastapi-elasticsearch-opensearch/pull/223)
 
 
 ### Changed