feat: add 11ty image plugin for image optimization

[zeroedin]

What I did

• Added eleventy-img plugin which helps optimize image loading by providing correct height and width for images and enables defaults of loading="lazy"
• Created a rhb-img component that uses the webc based implementation of the eleventy-img plugin. Modified to always output the same format as the extension of the image. As well as provide a data-attr to track the original src to help link the hashed image.
• Removed public folder in favor of just assets. This helps align the webc expectation of a local path in the src before transformation instead of a standard img tags end source of /assets/*
• Updated all pages to relink images using new paths
• Replaced all instances of missing alt attributes on images with alt="[ERROR: MISSING ALT TAG]" these will need resolved before merging see Missing alt tags #78
• Removed image calls to external sources (ie red hat logo in footer, and favicon) linking to RHDC, this was a lighthouse optimization (cookies) as well as enabling the webc image component.
• Moved video poster images to their own folder assets/posters as they are not standard images.
• Updated rollup.config to match pathing changes
• BONUS: Added font-display: swap; to font css as a Lighthouse optimization.

Closes #38

TODO:

• Fix missing alt tags with proper descriptive text

Testing instructions

• View Deploy preview, look for broken links

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