Feat: add documentation (MkDocs)

[lemontree210]

Summary

This PR adds MkDocs-based documentation for the TinyBear project, including a minimal and user-friendly configuration for deployment to GitHub Pages under the /tinybear subpath.

Key Changes

Documentation Structure

Added docs/ directory with the following documentation files:
index.md (project overview and navigation)
getting_started.md (install/setup instructions)
usage.md (basic module usage)
api.md (auto-generated reference for all public functions and classes)

MkDocs Configuration

Added an optimized mkdocs.yml configured for /tinybear subpath hosting on GitHub Pages.
Navigation includes Home, Getting Started, Usage, and API Reference.
Proper site_url and navigation for correct subdirectory behavior.

GitHub Actions Workflow

Added .github/workflows/deploy.yml to automatically build and deploy docs to the gh-pages branch using peaceiris/actions-gh-pages.
Deployment ensures documentation is available at https://lemontree210.github.io/tinybear, without interfering with the blog at the root GitHub Pages.

PyPI Metadata Improvements

Updated documentation URL in pyproject.toml for clearer links from PyPI.

How to Test

The workflow is configured to trigger on pushes to the target branch (update to master before merge).
After merging, the Action will build the MkDocs documentation and deploy to the gh-pages branch.
Documentation will be available at: https://lemontree210.github.io/tinybear/.

Additional Notes

This separates project documentation cleanly for users while allowing the main root GitHub Pages site (blog) to remain unaffected.
All internal links and navigation are set up with the correct /tinybear/ prefix.
You may further extend the documentation by updating docs/ as needed.

[Copilot]

Pull Request Overview

This PR adds MkDocs documentation infrastructure to the TinyBear project, including documentation pages, configuration, and automated deployment to GitHub Pages.

• Adds MkDocs configuration with Material theme and documentation structure
• Creates initial documentation pages covering getting started, usage, and API reference
• Sets up GitHub Actions workflow for automated documentation deployment

Reviewed Changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
pyproject.toml	Adds MkDocs dependencies, updates project URLs, and bumps version to 0.3.1
mkdocs.yml	Configures MkDocs with Material theme and navigation structure
docs/index.md	Creates main documentation homepage with project overview
docs/getting_started.md	Provides installation and setup instructions
docs/usage.md	Documents basic usage examples and module imports
docs/api.md	Comprehensive API reference for all tinybear modules
.github/workflows/deploy.yml	GitHub Actions workflow for automated documentation deployment

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[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.18%. Comparing base (f407e5a) to head (a3a40c9).
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Additional details and impacted files

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##           master       #4   +/-   ##
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  Coverage   98.18%   98.18%           
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  Files          17       17           
  Lines         828      828           
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  Hits          813      813           
  Misses         15       15           

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