Provide the color mode button in every Stackblitz example

[louismaximepiton]

Description

Add the theme toggler to the StackBlitz examples.
Don't hesitate to propose your ideas.

Motivation & Context

Help people seing the dark mode with live examples.

Type of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Refactoring (non-breaking change)
• Breaking change (fix or feature that would change existing functionality)

Checklist

• I have read the contributing guidelines
• My code follows the code style of the project (using npm run lint)
• My change introduces changes to the documentation
• I have updated the documentation accordingly
• I have added tests to cover my changes
• All new and existing tests passed

Live previews

• https://deploy-preview-39112--twbs-bootstrap.netlify.app/docs/5.3/components/accordion/ (for instance)

Related issues

Might close some items in #37549.

[julien-deramond]

I have mixed feelings about this feature. On one hand, I find it useful because one doesn't have to integrate the whole system manually and can help to represent or test something in StackBlitz. On the other hand, it adds a lot of code in the index.html in StackBlitz and folks can be lost with this amount of code compared to the simplicity of just having the source code of the component for instance from the documentation.

Without this feature, they still can start from https://github.com/twbs/examples/tree/main/color-modes or simply add data-bs-theme="dark" on the body (or somewhere else) if they want to test something specific to the dark mode.

@mdo Do you have a strong opinion regarding this new doc feature?

[louismaximepiton]

Just revamped the template so it's way more understandable from a user pov (There's no more html added to the markup and the js stands aside). What'd you think of this solution ? It might be worth a try.