[Feature] Allow users to install Inspirations starter content styles without having to Start Over

[joe9663]

Is your feature request related to a problem? Please describe.
Contact from UserEcho. User has already created their own custom content on their website and wants to apply styles from an Inspiration content set without removing any of their existing content. Before V1 themes were converted into Crio content sets, users were able to select a new theme from the Add Themes page to achieve a new design without destroying existing content.