Create components playground

[davestewart]

Background

Spectre has a lot of variables, but they are mainly undocumented.

It would be good to provide a playground with which to test variables.

Proposal

Create a way to test Spectre CSS and its variables.

Some kind of Vite setup would be ideal.

Would it be in this repo or external?

Notes

See:

• Provide components kitchen sink spectre-docs#27
• https://github.com/spectre-org/spectre-toolbox