Theme Builder

[mattfwood]

The "Theme Builder" is a feature for Minerva that provides a design tool-like UI to create and export a theme object that can be used by Minerva.

The left section should display all the components in addition to theme variables and examples.

The middle section should display the current component with the active theme.

The right section should be an inspector / devtools-like interface to edit CSS properties in a user-friendly way.

Requirements:

• Allow every component in the library to be customized
• In the "inspector" on the right side, make aliases available from a dropdown (for example, if shadows have keys of base, sm, md, etc, the user should be able to manually type in a box shadow or select from those predefined values
• Allow theme variables like colors and shadows to be customized / extended
• Export a theme object that's usable by Minerva
• Include "demo" or "example" sections that display the Minerva docs examples, but with the current created theme
• Save theme in localStorage