dhi: add mcp server

[craig-osterhout]

Description

Added topic for DHI mcp server. (main point of this PR)
Added a "tools" section in order to have a home for the mcp topic. It includes:

• mcp (new)
• cli (moved from how-to)
• hub (new, moved relevant content from explore how-to)
• terrarform (new, aggregates content from how-tos)

Re-orged topics because adding "tools" made the top-level nav overloaded:

• Moved core concepts into explore to reduce top-level navigation overload. Keeps most of the conceptual stuff in one place.
• Moved troubleshoot into how-to to reduce top-level navigation overload. Keeps most of the tasks in one place.
• Merged feedback into additional resources as it is awkward under explore. Been meaning to do it for awhile.
• Merged features into main index page to reduce top-level navigation overload. Removed a lot of the fluff. Keeps most of the marketing stuff in one place.

The how-to section is still a bit too much. That's a harder problem and this PR already scope-creeped enough.

Related issues or tickets

ENGDOCS-3337

Reviews

• Technical review
• Editorial review
• Product review

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[docker-agent]

Assessment: 🟡 NEEDS ATTENTION

1 medium finding in new content added by this PR.

[docker-agent]

Assessment: 🟢 APPROVE

Verified redirect (alias) coverage for all 21 moved/renamed pages — every deleted or relocated page has a correct aliases: entry in its new location. The new mcp.md page is well-structured, uses proper front matter, avoids style-guide violations (no hedge words, no AI-isms, no marketing language), and the content is accurate. Two minor style suggestions are left as inline comments.

[docker-agent]

Assessment: 🟢 APPROVE

The PR adds a new DHI MCP server documentation page and reorganizes the DHI navigation structure (adding a tools section, moving core-concepts into explore, moving troubleshoot into how-to). All reviewed items look correct:

• Redirects: All moved/removed pages have proper aliases: entries covering the old URLs (core-concepts → security-concepts, troubleshoot, feedback, cli, features)
• New mcp.md: Front matter is complete, content is accurate, Docker Agent YAML config (remote: + transport_type: streamable) matches the vendored Docker Agent configuration reference
• Style: No hedge words, AI-isms, or style violations found in the new content
• Tool count: Stated "ten tools" matches the ten-row table

[docker-agent]

Assessment: 🟡 NEEDS ATTENTION

One style guide violation found in the new MCP server documentation page. All other areas are clean: front matter is complete, shortcode syntax is correct, the security warning callout is appropriate, the base64 command is accurate, link text is descriptive, and no hedge words or AI-isms were found.