docs: add Plugin Marketplace setup guide under Enterprise tab

[jpelletier1]

Summary of changes

Adds a new Enterprise documentation page covering how to enable and configure the Plugin Marketplace (plugin-directory) feature in OpenHands Enterprise, for both VM-based (Replicated Admin Console) and Kubernetes (Helm) installations.

New file: enterprise/plugin-marketplace.mdx

Covers:

• Overview — what the Plugin Marketplace is; experimental feature callout
• Prerequisites — running OHE deployment, PostgreSQL, Marketplace Source URI
• VM Install (Admin Console) — step-by-step walkthrough: Admin Console → Config → Experimental → Enable Plugin Directory → set Marketplace Source → Save & Deploy
• Kubernetes (Helm) — full values.yaml snippet, required secrets, helm upgrade command, database migration notes
• Marketplace Source URI — table of all supported URI formats (github://owner/repo[@ref] and https://...)
• Accessing the Marketplace — URLs for the frontend (/plugins) and API (/api/plugins)
• Disabling — how to turn it off on both install paths
• Next Steps — links to Quick Start, External PostgreSQL, K8s Install, Enterprise Overview

Updated file: docs.json

Added enterprise/plugin-marketplace to the OpenHands Enterprise navigation group in the Enterprise tab (after external-postgres).

---

• I have read and reviewed the documentation changes to the best of my ability.
• If the change is significant, I have run the documentation site locally and confirmed it renders as expected.

---

This PR was created by an AI agent (OpenHands) on behalf of the user.

@jpelletier1 can click here to continue refining the PR

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[jpelletier1]

@OpenHands Please position the /enterprise/images/PluginMarketplaceClip.gif image at the top of the enterprise/plugin-marketplace page. Maybe to the right of the text above #prerequisites

[openhands-ai]

I'm on it! jpelletier1 can track my progress at all-hands.dev

[jpelletier1]

Done — added the PluginMarketplaceClip.gif to the right of the introductory paragraph and Note callout using a flex-row layout (commit 78c6f28). The GIF sits alongside the text above the Prerequisites section with a max-width: 300px and rounded corners.

This comment was added by an AI agent (OpenHands) on behalf of the user.

[openhands-ai]

Summary

Request

Position /enterprise/images/PluginMarketplaceClip.gif at the top of the enterprise/plugin-marketplace page, to the right of the text above #prerequisites.

What was done

• Identified the target location — the introductory paragraph and <Note> callout immediately after the frontmatter, above ## Prerequisites
• Wrapped the intro content in a flex-row layout — a two-column <div style={{display: 'flex', ...}}> wraps:
  • Left: existing paragraph text + <Note> component (flex: 1)
  • Right: <img> pointing to /enterprise/images/PluginMarketplaceClip.gif (flexShrink: 0, maxWidth: 300px, rounded corners)
• No unrelated changes — only the intro block was touched; all other page content is unchanged
• Committed (78c6f28) and pushed to origin/enterprise/plugin-marketplace-docs, updating PR docs: add Plugin Marketplace setup guide under Enterprise tab #540
• Replied to the PR comment confirming the fix with the commit SHA

The change is minimal and surgical — exactly 7 lines added to position the GIF inline with the intro text, nothing else modified.