Source dataverse plugin externally from microsoft/Dataverse-skills (#1010)

* Source dataverse plugin from microsoft/Dataverse-skills

The Dataverse plugin was previously bundled locally with a single
mcp-configure skill. It is now sourced externally from
microsoft/Dataverse-skills, which provides the full skill set:
init, setup, metadata, python-sdk, solution, mcp-configure, and overview.

- marketplace.json: update dataverse entry to external source format
- external.json: add Dataverse entry alongside Azure
- plugins/dataverse/: remove local plugin directory (now external)
- skills/mcp-configure/: remove top-level copy (now in external plugin)
- docs/README.plugins.md: update dataverse row with external link
- docs/README.skills.md: note mcp-configure moved to external plugin

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Make dataverse plugin docs generic to avoid stale counts

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Remove mcp-configure from skills index — now in external plugin

External plugins don't list their skills in README.skills.md
(consistent with azure-skills).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Revert manual edits to generated files

marketplace.json, README.plugins.md, and README.skills.md are
auto-generated. External plugins are discovered via external.json
and merged into marketplace.json by generate-marketplace.mjs.
Matches the Azure external plugin pattern — no manual doc entries.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Regenerate marketplace.json and docs after external plugin change

Run npm run build to pick up the new external dataverse entry and
remove the old local one from generated files.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

docs/README.plugins.md

@@ -35,7 +35,6 @@ See [CONTRIBUTING.md](../CONTRIBUTING.md#adding-plugins) for guidelines on how t
 | [csharp-dotnet-development](../plugins/csharp-dotnet-development/README.md) | Essential prompts, instructions, and chat modes for C# and .NET development including testing, documentation, and best practices. | 9 items | csharp, dotnet, aspnet, testing |
 | [csharp-mcp-development](../plugins/csharp-mcp-development/README.md) | Complete toolkit for building Model Context Protocol (MCP) servers in C# using the official SDK. Includes instructions for best practices, a prompt for generating servers, and an expert chat mode for guidance. | 2 items | csharp, mcp, model-context-protocol, dotnet, server-development |
 | [database-data-management](../plugins/database-data-management/README.md) | Database administration, SQL optimization, and data management tools for PostgreSQL, SQL Server, and general database development best practices. | 6 items | database, sql, postgresql, sql-server, dba, optimization, queries, data-management |
-| [dataverse](../plugins/dataverse/README.md) | Comprehensive collection for Microsoft Dataverse integrations. Includes MCP setup commands. | 1 items | dataverse, mcp |
 | [dataverse-sdk-for-python](../plugins/dataverse-sdk-for-python/README.md) | Comprehensive collection for building production-ready Python integrations with Microsoft Dataverse. Includes official documentation, best practices, advanced features, file operations, and code generation prompts. | 4 items | dataverse, python, integration, sdk |
 | [devops-oncall](../plugins/devops-oncall/README.md) | A focused set of prompts, instructions, and a chat mode to help triage incidents and respond quickly with DevOps tools and Azure resources. | 3 items | devops, incident-response, oncall, azure |
 | [doublecheck](../plugins/doublecheck/README.md) | Three-layer verification pipeline for AI output. Extracts claims, finds sources, and flags hallucination risks so humans can verify before acting. | 2 items | verification, hallucination, fact-check, source-citation, trust, safety |