Draft: 🚀 v1.0.3 | development docs

• ✨ Move setup.py contents to pyproject.toml

• 📚 Use Markdown not RST for the README

• 📚 Use Markdown not RST for AUTHORS

• 📚 Use Markdown not RST for CHANGELOG

• 📚 Use Markdown not RST for CONTRIBUTING

• 📚 Remove remaining RST docs

• 📦 v1.0.2 is available, upgrade from 1.0.0

• ✍️ Migrate docs to Astro

• ✂️ Lose extraneous reference page

• Revert "📦 v1.0.2 is available, upgrade from 1.0.0"

This reverts commit 695594636d0365c201c61a11cce588326b25aa7e.

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