Remove the "A powerful new way to style your site" modal

[richtabor]

Let's consider removing this modal here and instead rely on a central source for getting the user to subscribe (My Home launch pad item for example, if custom styles are present), rather than a variety of modals and calls to action, like this one.

It's also not clear why I should upgrade at this point, as I've only just opened the styles panel in the editor—not actually applied any.

[github-actions[bot]]

OpenAI suggested the following labels for this issue:

• [Feature Group] Appearance & Themes: The issue pertains to a modal related to styling sites, which falls under appearance features.
• [Feature] User Interaction & Engagement: The modal's removal is aimed at improving user engagement with a centralized subscription option rather than multiple pop-ups.
• [Feature] My Home: The suggestion involves using 'My Home' as the focal point for user interactions instead of the modal.
• [Feature] Plans & Upgrades: The body expresses confusion about the need to upgrade, indicating a relevance to user upgrade options.