chore: add canary releases doc

docs/src/canary-releases-js.md

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+---
+id: canary-releases
+title: "Canary Releases"
+---
+
+Playwright for Node.js has a canary releases system.
+
+It permits you to **test new unreleased features** instead of waiting for a full release. They get released daily on the `next` NPM tag of Playwright.
+
+It is a good way to **give feedback to maintainers**, ensuring the newly implemented feature works as intended.
+
+:::note
+
+Using a canary release in production might seem risky, but in practice, it's not.
+
+A canary release passes all automated tests and is used to test e.g. the HTML report, Trace Viewer, or Playwright Inspector with end-to-end tests.
+
+:::
+
+```
+npm install -D @playwright/test@next
+```
+
+## Next npm Dist Tag
+
+For any code-related commit on `main`, the continuous integration will publish a daily canary release under the `@next` npm dist tag.
+
+You can see on [npm](https://www.npmjs.com/package/@playwright/test?activeTab=versions) the current dist tags:
+
+- `latest`: stable releases
+- `next`: next releases, published daily
+- `beta`: after a release-branch was cut, usually a week before a stable release each commit gets published under this tag
+
+## Using a Canary Release
+
+```
+npm install -D @playwright/test@next
+```
+
+## Documentation
+
+The stable and the `next` documentation is published on [playwright.dev](https://playwright.dev). To see the `next` documentation, press <kbd>Shift</kbd> on the keyboard `5` times.