Tinyvdiff

Documentation

- Use `pip` and `python3` in installation instructions consistently.
- Use more specific package description.

Documentation

- Added a [setup guide article](https://nanx.me/tinyvdiff/articles/setup/)
with a demo project detailing the steps and practical considerations for
using tinyvdiff in projects (20).

New features

- The pytest plugin now supports multi-page PDF files.
Each multi-page PDF will correspond to SVG snapshots with file name
suffixes `_p1.svg`, `_p2.svg`, `...` (15).
- Added a pytest parser option `--tinyvdiff-pdf2svg` to allow specifying a
custom path to `pdf2svg` in test files or project-wide `conftest.py`
when needed (18).

Testing

- Added unit tests for the low-level conversion and snapshotting facilities
that support the pytest plugin (17).

Improvements

- Exposed key functions in `__init__.py` so that users can use the simpler
`import tinyvdiff as tvd` and `tvd.` syntax to access them (16).

New features

- Added a pytest plugin for visual regression testing (11).

Improvements

- Refactored type hints to use shorthand syntax for union and optional types.
As a result, tinyvdiff now requires Python >= 3.10 (4).

New features

- Implemented a wrapper for the `pdf2svg` command line tool to convert
PDF files to SVG format.