docs: #3625390 Document the DDEV install and fix the shipped DDEV config

Rajab Natshahrequested to merge
issue/webship_project-3625390:3625390-docs-document-the into 11.0.x

Closes #3625390

The README only documented a host-Composer install. The shipped .ddev/config.yaml was also broken: webimage_extra_packages: ["php${DDEV_PHP_VERSION}-yaml"] makes ddev start fail with "Unable to locate package php8.4-yaml", and Node 18 contradicts package.json, which needs Node 20+.

Verified by following the README literally in a fresh DDEV project.

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