task: #3623488 Do not set minimum-stability in the site template README

Rajab Natshahrequested to merge
issue/website_starter-3623488:3623488-revert-minstab into 1.0.x

Closes #3623488

The site templates say nothing about minimum-stability. Only the Website project template sets it, in its own composer.json.

  • Take the step back out of the README

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

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