Docs: Add `<details><summary>` to hide design callouts

[louismaximepiton]

Note: Please transform - [ ] into - (NA) in the description when things are not applicable

Related issues

NA

Description

Added small CSS to handle these hidden parts. Some design callouts weren't hidden for understanding of the doc (navs&tabs, navbar, introduction, badge and so on).

Used several sentences:

• Other Bootstrap variants when one of the examples is ok but not the other(s)
• See Bootstrap example(s) if the example doesn't introduce any new class
• See Bootstrap variant(s) if the example introduces a new class

Several questions to answer before merging this:

• Is the design ok?
• Is the information loss fine?

Motivation & Context

Following the refactoring of buttons and dropdowns. Avoid polluting the user experience.

Types of change

• New feature (non-breaking change which adds functionality)

Live previews

• https://deploy-preview-2548--boosted.netlify.app/

Checklist

Contribution

• [x] I have read the contributing guidelines

Accessibility

• [x] My change follows accessibility good practices; I have at least run axe

Design

• [x] My change respects the design guidelines defined in Orange Design System
• [x] My change is compatible with a responsive display

Development

• [x] My change follows the developer guide
• [x] I have added JavaScript unit tests to cover my changes
• [x] I have added SCSS unit tests to cover my changes

Documentation

• [x] My change introduces changes to the documentation and/or I have updated the documentation accordingly

Checklist (for Core Team only)

• [ ] My change introduces changes to the migration guide
• [x] My new component is well displayed in Storybook
• [x] My new component is compatible with RTL
• [x] Manually run BrowserStack tests
• [x] Manually test browser compatibility with BrowserStack (Chrome >= 60, Firefox >= 60 (+ ESR), Edge, Safari >= 12, iOS Safari, Chrome & Firefox on Android)
• [ ] Code review
• [ ] Design review
• [ ] A11y review

After the merge

• [ ] Manually launch Percy tests

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