chore: Homepage images sizing on small screens

What does this MR do?

Update homepage styles so that images load correctly on mobile. Fix layout to avoid x-axis overflow on smaller screens e.g. 320px.

• Remove .max-w-sm class and _alignment.scss file
• Update homepage two-column layout styles and markup
• Hide presentational images from accessibility tree

Closes #1466 (closed)

Screenshots

Description	Before	After
Desktop
Mobile
Section