Image integration refactor and cleanup

[tony-sull]

Changes

• Images in /public can now be used like remote images 🎉

<!-- The image will now be pulled in from /public/hero.jpg -->
<Image src="/hero.jpg" width={768} height={414} format="webp" />

• Moves work for reading local image files into Vite (where it belongs)
• Removes most of Node dependencies that get bundled into the SSR bundle (deno support coming soon!)
• Removes the nasty glob that the SSR build was doing
• Simplifies the injected endpoint routes, mainly due to leaning further into Vite

Testing

Tests updated to match the new logic, mainly related to output filenames including Vite hashes

Docs

README updated with a few details on using /public images

[changeset-bot]

🦋 Changeset detected

Latest commit: 11f16fa

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@astrojs/image	Minor

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[tony-sull]

Flipping this back to draft to test out a few more potential optimizations

[sarah11918]

Ooh, you're gonna make lots of people happy, @tony-sull 🥳

Left some suggestions for your consideration! Including a reminder that you can set a file name for a code sample and get a fancy Hippo title tab for your snippet.