[unified-server] Stage index.html during build

[timswanson-google]

This change replaces the hand-coded version of the index.html (which was copied from visual editor) with a version that is copied automatically during staging, as a prerequisite to the build.

Entry points do not change.

The only meaningful difference between the two HTML files was that the unified server version replaced this:

breadboard/packages/visual-editor/index.html

Line 42 in c3816e4

const { Main } = await import("./src/index.ts");

With this:

breadboard/packages/unified-server/index.html

Line 38 in c3816e4

const { Main } = await import("@breadboard-ai/visual-editor");

However, a direct copy from the visual editor works as long as the Main class can be imported from a source file found at ./src/index.ts. So a file is added to unified-server that re-exports the the visual-editor module.

Fixes #4350

[changeset-bot]

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Latest commit: 60a3e46

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[paullewis]

LGTM!