Import a stand-alone starter content file

[bph]

• Write the content of the file starter-content.php into the plugin directory
• Active the plugin
• Use the "importThemeStarterContent" step.
• User lands on home page and can see the starter content on the "Our Subscriptions" page.
  

Thank you to @bgrgicak for inspiration.

[github-actions]

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Test this pull request with WordPress Playground.

[zaerl]

It needs a couple of fixes to make. Good work.

[zaerl]

Thanks for the fixes. 🚢