task: #3623483 Build with Composer inside DDEV in the README

Rajab Natshahrequested to merge
issue/website_starter-3623483:3623483-ddev-readme into 1.0.x

Closes #3623483

The README started with a Composer command on the host, and the project page now shows the DDEV steps.

  • Build the project with Composer inside DDEV, from the alpha release
  • Install with the site name, the webmaster account and this site template
  • Apply it as a recipe on a site that is already installed

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Checkpoints

  • Issue created with a clear summary
  • Merge request opened against 1.0.x
  • CI pipeline passes

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