Add Hello World HTML page

[google-labs-jules]

This PR adds a basic index.html file with a "Hello World" heading.
The page has been verified to render correctly using a frontend verification script.

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PR created automatically by Jules for task 8112690866082996484 started by @BeksOmega

[google-labs-jules]

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[github-actions]

Jules Task Info

Original Prompt:
Can you create a tiny "hello world" html page and then use frontend verification to verify it works?

Latest Media Artifact:

A media artifact (image/png) was found and has been uploaded as a workflow artifact named jules_artifact.png.