Fix pyproj readme (stac-utils#507)

**Related Issue(s):**

- None

**Description:**
- symlinks for readme were not working with new pyproject.toml for
publishing build

**PR Checklist:**

- [x] Code is formatted and linted (run `pre-commit run --all-files`)
- [x] Tests pass (run `make test`)
- [x] Documentation has been updated to reflect changes, if applicable
- [x] Changes are added to the changelog

Author: jonhealy1

stac_fastapi/core/README.md

@@ -0,0 +1,20 @@
+# stac-fastapi-core
+
+Core functionality for stac-fastapi. For full documentation, please see the [main README](https://github.com/stac-utils/stac-fastapi-elasticsearch-opensearch/blob/main/README.md).
+
+## Package Information
+
+- **Package name**: stac-fastapi-core
+- **Description**: Core functionality for STAC API implementations.
+- **Documentation**: [https://stac-utils.github.io/stac-fastapi-elasticsearch-opensearch/](https://stac-utils.github.io/stac-fastapi-elasticsearch-opensearch/)
+- **Source**: [GitHub Repository](https://github.com/stac-utils/stac-fastapi-elasticsearch-opensearch/)
+
+## Installation
+
+```bash
+pip install stac-fastapi-core
+```
+
+## Quick Start
+
+For detailed usage and examples, please refer to the [main documentation](https://stac-utils.github.io/stac-fastapi-elasticsearch-opensearch/).

stac_fastapi/core/README.md

@@ -0,0 +1,20 @@
+# stac-fastapi-elasticsearch
+
+This is the Elasticsearch backend for stac-fastapi. For full documentation, please see the [main README](https://github.com/stac-utils/stac-fastapi-elasticsearch-opensearch/blob/main/README.md).
+
+## Package Information
+
+- **Package name**: stac-fastapi-elasticsearch
+- **Description**: An implementation of STAC API based on the FastAPI framework with Elasticsearch.
+- **Documentation**: [https://stac-utils.github.io/stac-fastapi-elasticsearch-opensearch/](https://stac-utils.github.io/stac-fastapi-elasticsearch-opensearch/)
+- **Source**: [GitHub Repository](https://github.com/stac-utils/stac-fastapi-elasticsearch-opensearch/)
+
+## Installation
+
+```bash
+pip install stac-fastapi-elasticsearch
+```
+
+## Quick Start
+
+For detailed usage and examples, please refer to the [main documentation](https://stac-utils.github.io/stac-fastapi-elasticsearch-opensearch/).

stac_fastapi/elasticsearch/README.md

@@ -0,0 +1,20 @@
+# stac-fastapi-opensearch
+
+This is the OpenSearch backend for stac-fastapi. For full documentation, please see the [main README](https://github.com/stac-utils/stac-fastapi-elasticsearch-opensearch/blob/main/README.md).
+
+## Package Information
+
+- **Package name**: stac-fastapi-opensearch
+- **Description**: An implementation of STAC API based on the FastAPI framework with OpenSearch.
+- **Documentation**: [https://stac-utils.github.io/stac-fastapi-elasticsearch-opensearch/](https://stac-utils.github.io/stac-fastapi-elasticsearch-opensearch/)
+- **Source**: [GitHub Repository](https://github.com/stac-utils/stac-fastapi-elasticsearch-opensearch/)
+
+## Installation
+
+```bash
+pip install stac-fastapi-opensearch
+```
+
+## Quick Start
+
+For detailed usage and examples, please refer to the [main documentation](https://stac-utils.github.io/stac-fastapi-elasticsearch-opensearch/).

stac_fastapi/elasticsearch/README.md

@@ -0,0 +1,22 @@
+# sfeos-helpers
+
+Helper utilities for the stac-fastapi project. For full documentation, please see the [main README](https://github.com/stac-utils/stac-fastapi-elasticsearch-opensearch/blob/main/README.md).
+
+## Package Information
+
+- **Package name**: sfeos-helpers
+- **Description**: Helper utilities for the stac-fastapi project.
+- **Documentation**: [https://stac-utils.github.io/stac-fastapi-elasticsearch-opensearch/](https://stac-utils.github.io/stac-fastapi-elasticsearch-opensearch/)
+- **Source**: [GitHub Repository](https://github.com/stac-utils/stac-fastapi-elasticsearch-opensearch/)
+
+## Installation
+
+This package is a dependency of stac-fastapi-elasticsearch and stac-fastapi-opensearch and is typically installed automatically.
+
+```bash
+pip install stac-fastapi-elasticsearch  # or stac-fastapi-opensearch
+```
+
+## Quick Start
+
+For detailed usage and examples, please refer to the [main documentation](https://stac-utils.github.io/stac-fastapi-elasticsearch-opensearch/).