ci(installer): remove `vc link` which generates the wrong project

`vc link` is not needed, as we already have `VERCEL_PROJECT_ID`
defined as an env variable. Currently the `vc link` only creates
a second empty project with the name `installer` as seen in logs:

  Linked to ohmyzsh/installer (created .vercel and added it to .gitignore)
  Vercel CLI 32.2.4