Publish acture-a11y: create the npm name and set its trusted publisher (needs your npm login) #76

Part of #70 (steps 1-2 are in #75). The owner's decision on #70 was to publish acture-a11y.

Do not merge the "chore(release): version packages" PR until both steps below are done: the release job would try to publish a name that does not exist on npm yet and fail (same pattern as #65).

1. First publish by hand (a new name cannot use trusted publishing until it exists). In a tw session, from a checkout of this repo after a11y: make acture-a11y publishable (#70 steps 1-2) #75 is merged and the build is done:

   npm login --auth-type=web
   cd packages/a11y && npm publish --access public
   

2. Register the trusted publisher on the package's settings page: https://www.npmjs.com/package/acture-a11y/access (Trusted Publisher section: GitHub Actions, repository i2mint/acture, workflow release.yml).

Then merge the Version Packages PR. Done when npm view acture-a11y version returns a version and the release run is green.