Removed starterkit.php file and no-edit key from the starterkit.yml.

Nikita Aswanirequested to merge
issue/governor-3480631:3480631-no-edit-error into 1.0.x

Currently, in The Governor starterkit.php file we are manually updating the file info and renaming files which is not needed. generate-theme takes care of it. Check - https://mglaman.dev/blog/improving-drupal-theme-starterkit-and-theme-generation-experience.

Also, since we are not using starterkit.md file anymore, removed its reference from the starterkit.yml.

Closes #3480631

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