docs: make custom doc home page

Author: gadomski

docs/index.md

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+# rustac
+
+> The power of Rust for the Python STAC ecosystem.
+
+**rustac** is a zero-dependency Python package for [STAC](https://stacspec.org/) using Rust under the hood.
+
+## Installation
+
+```shell
+python -m pip install rustac
+```
+
+If you'd like to use `arrow` tables, e.g. to load into GeoPandas:
+
+```shell
+python -m pip install 'rustac[arrow]'
+```
+
+## Usage
+
+```python
+import rustac.blocking
+
+item = rustac.blocking.read("item.json")
+
+# Or, for async
+import asyncio
+import rustac
+
+def main() -> None:
+    item = await rustac.read("item.json")
+
+asyncio.run(main())
+```
+
+For more, see our [examples](./generated/gallery/index.md).

docs/index.md

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-site_name: rustac-py
-site_description: A small no-dependency Python package for STAC, using Rust under the hood.
+site_name: rustac
+site_description: The power of Rust for the Python STAC ecosystem
 site_url: https://stac-utils.github.io/rustac-py
 repo_url: https://github.com/stac-utils/rustac-py
 theme: