docs: replace Introduction hero image with the TrueForge overview diagram

[shubhamagarwal-create]

Replaces the first image on the Introduction page with the TrueForge overview diagram (model providers + skills + tools feeding the open-source agent harness, out to your AI application).

• Adds docs/images/trueforge-overview.png and points the first <Frame> at it.
• Removes the now-unused docs/images/agent-harness-definition.png (it was only referenced on this page).
• Updates the caption and alt text to match the new diagram.

Note: the image has a white background and is used as a single image, so it renders white in dark mode (same as the image it replaces). A light/dark pair can be added later if a dark version is provided.

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Note

Low Risk
Documentation and static image assets only; no runtime or API behavior changes.

Overview
Updates the Introduction page hero so it shows the TrueForge overview diagram instead of the generic agent-harness illustration.

The first <Frame> now uses /images/trueforge-overview.png, with caption and alt text rewritten to describe TrueForge’s architecture (models, skills, MCP tools → harness → your app). The PR also adds that asset and drops the old agent-harness-definition.png, which was only used here.

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Latest commit: 62a24b3

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