v2 tt5 demo

[bph]

blueprint to

• load wp beta
• login and use modern admin color
• empty site completely
• set pretty links
• Site title and description
• import demo content.

This PR also updated the Blueprint Gallery.md to make it available from the Playground site, too

[github-actions[bot]]

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For more details about these limitations and more, check out the Limitations page in the WordPress Playground documentation.

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