docs: resize docs bundler images and fix dimensions

[XhmikosR]

The dimensions must be of the non-2x image.

Description

Motivation & Context

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-39824--twbs-bootstrap.netlify.app/docs/5.3/getting-started/parcel/
• https://deploy-preview-39824--twbs-bootstrap.netlify.app/docs/5.3/getting-started/vite/
• https://deploy-preview-39824--twbs-bootstrap.netlify.app/docs/5.3/getting-started/webpack/

Related issues

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TODO:

• optimize the images but look out for color changes