- Add https://github.com/playwright-community/eslint-plugin-playwright
as a linter for the playwright tests.
- `no-networkidle` and `no-conditional-in-test` are disabled as fixing
those doesn't seem to really improve testing quality for our use case.
- Some non-recommended linters are enabled to ensure consistency (the
prefer rules).
This should be a failing test for Firefox (but working in Chrome?) for
the taborder in the explore page.
Tabbing through the page should ensure that certain elements are focused
at least once.