Home page episode list with sidebar layout and image partial refactors

[mattstratton]

Summary

• Home page (/) now displays the episode list in a 2/3 width column with the sidebar partial in the right 1/3, using a responsive flex layout.
• All <img> tags for person, blog, episode, and host images in the layouts directory (except seo.html) have been refactored to use the functions/image.html partial for consistency and maintainability.

Testing Steps

• Visit the home page and verify the new layout: episode list (2/3) and sidebar (1/3).
• Check other pages to ensure they retain their previous full-width layout.
• Confirm all images render correctly and use the image partial.

Context

This PR improves maintainability and consistency for image rendering and enhances the home page layout for a more modern, content-focused experience.

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