[FEATURE GJS Banner] add GJS Format banner for currentVersion

[coremore35]

This pull request introduces a new informational banner to the guides article page when the current version is GJS, and updates related styles for consistency and improved accessibility. The most significant changes are the addition of the GJS info banner component, updates to CSS for the new banner, and several minor style consistency improvements.

Feature addition:

• Added a conditional info banner to guides-article.hbs that appears when the current version is GJS, informing users that the guide assumes GJS usage and linking to more information. The banner includes an accessible SVG icon and appropriate ARIA labels.

Styling and consistency improvements:

• Updated .info-banner-wrapper and related CSS classes in addon.css to style the new info banner, including layout, padding, border radius, and link appearance.
• Modified the shared icon styles so that both the old version warning and info banner icons are consistently sized and aligned.
• Improved formatting and consistency in CSS selectors and properties, such as spacing, color codes, and selector quoting, to align with project style guidelines. [1] [2] [3] [4] [5]

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[mansona]

thanks for the contribution 🎉