* Docs tests: remove leading slash
* Fix slash handling in link-data.json for the C++ docs
* Fix trailing slash handling for link-data.json for the Rust API docs
---------
Co-authored-by: Simon Hausmann <simon.hausmann@slint.dev>
Bring back playwright tests.
Archive playwright test report to make it easier to debug failed test runs.
Better define a BASE_URL and BASE_PATH so the playwright tests happily work during a release.