v0.10.0

fix: point the README banner at a URL we control

The banner was a `user-attachments` upload that has since 404'd, so the README
opened with a broken image. It now comes from `rewire.run/brand/rewire-banner.png`,
rendered from the same vector as every other mark by `bun run press-kit` in the
web repo and served off the site, so it cannot disappear out from under us again.

Also drops the `www.` from the wrapping link, which has no DNS record and so
failed to resolve, and gives the image an `alt` that names the mark.