feat(index): add landing page

index.md

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+# pyOpenSci Lessons
+
+More here
+
+::::{grid} 2
+:reverse:
+
+:::{grid-item}
+:columns: 4
+:class: sd-m-auto
+
+:::
+
+:::{grid-item}
+:columns: 8
+:class: sd-fs-3
+
+```{only} html
+![GitHub release (latest by date)](https://img.shields.io/github/v/release/pyopensci/python-package-guide?color=purple&display_name=tag&style=plastic)
+[![](https://img.shields.io/github/stars/pyopensci/python-package-guide?style=social)](https://github.com/pyopensci/contributing-guide)
+[![DOI](https://zenodo.org/badge/556814582.svg)](https://zenodo.org/badge/latestdoi/556814582)
+```
+
+:::
+::::
+
+::::{admonition} About this guide
+About here
+::::
+
+```{button-link} https://github.com/pyOpenSci/python-package-guide#contributors-
+:color: primary
+:class: sd-rounded-pill float-left
+
+View contributors
+
+```
+
+## Who this guidebook is for
+
+This is a living guide that is updated as tools and best practices evolve in the Python packaging ecosystem. We will be adding new content over the next year.