Replace MkDocs with Marimo and rename to scikit-play

[koaning]

Summary

• Replaced MkDocs documentation with an interactive Marimo notebook
• Renamed the project from scikit-playtime to scikit-play
• Changed import name from playtime to skplay

Changes

Documentation Migration

• Created docs.py - a single Marimo notebook containing all documentation
• Added WASM export capability for browser-based interactive Python execution
• Removed MkDocs configuration (mkdocs.yml) and old markdown files
• Updated Makefile with new marimo commands for editing, serving, and building docs

Project Rename

• Renamed package directory from playtime/ to skplay/
• Updated all imports throughout the codebase:
  • Source code files
  • Test files
  • Documentation
  • README
• Updated pyproject.toml with new project name and package references
• Updated GitHub repository URLs in configuration

Test plan

• Install the package: uv pip install -e ".[dev]"
• Run the interactive docs: make docs-serve
• Build WASM docs: make docs-build
• Run tests: pytest
• Verify imports work: from skplay import feats, onehot

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