Block theme builder on WordPress.org

Let's empower designers to build block themes with a dedicated builder tool available directly from WordPress.org.

As a designer, I would:

• Go to wordpress.org/theme/create
• Choose a parent theme to fork (or not)
• Make any customizations I need
• Close my browser tab and return later without losing my progress
• Click a "Submit to theme directory" button

I could also:

• Load my existing theme from the theme directory
• Make changes
• Submit the updated version with a click of a button

This workflow could potentially also offer the GitHub export and import feature.

Open questions

Before this project starts, there are some questions to answer:

• What other ingredients are required to submit a block theme?
  • readme.txt – how should the designer edit that in block theme builder?
  • ...what else?

What important factors is this issue missing @beafialho @jasmussen @mtias ?

No files, tests, or entry points are named. Start by resolving the open questions about theme submission requirements, readme.txt editing, persistence, and GitHub import/export; done would require a defined builder workflow and submission scope.