Use .d-none instead of inline styling

[julien-deramond]

Description

This PR proposes to use .d-none instead of inline styling (style="display: none") whenever possible. Especially in our examples for the list of SVGs defined at the beginning of the file.

Type of changes

• Refactoring (non-breaking change)

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
• (N/A) I have added tests to cover my changes
• All new and existing tests passed

Live preview

[mdo]

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