set up playwright

[ks6088ts]

What this PR does / why we need it

• set up playwright

Which issue(s) this PR fixes:

Fixes #1

Does this introduce a breaking change?

[ ] Yes
[x] No

Pull Request Type

What kind of change does this Pull Request introduce?

[ ] Bugfix
[x] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Documentation content changes
[ ] Other... Please describe:

How to Test

• Get the code

ORGANIZATION=<organization-name>
REPOSITORY=<repository-name>

git clone [email protected]:$ORGANIZATION/$REPOSITORY.git
cd $REPOSITORY

• Test the code

make ci-test

What to Check

Verify that the following are valid

• ...

Additional Information

[Copilot]

Pull Request Overview

This PR sets up Playwright for the repository by introducing new tests, updating project dependencies, and enhancing the documentation with setup and usage instructions.

• Added Playwright-based tests to scrape bookmarks and verify pages in tests/test_hatena_bookmark.py and tests/test_core.py.
• Updated pyproject.toml with Playwright and pytest-playwright dependencies.
• Enhanced docs/index.md with installation and guide details.

Reviewed Changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated no comments.

File	Description
tests/test_hatena_bookmark.py	New test to extract bookmark info from Hatena bookmark page.
tests/test_core.py	Added tests to verify page titles and navigation via Playwright.
pyproject.toml	Updated dependencies to include Playwright packages.
docs/index.md	Included installation instructions and guides for Playwright.

Files not reviewed (1)

• Makefile: Language not supported