Make Use of Astro Image Component for Better Optimization

[AdamGEmerson]

Hello,

I noticed that the template does not use the Astro Image component that was introduced in Astro 1.0

If we move assets into the src folder instead of public then Astro will be able to preprocess them and this could further improve performance.

I'd be happy to generate a PR for this if it is something you are open to.

Astro Images