docs: correctly roll intro into single OpenML Server nav item

[Gokul-social]

Fixes #208

This PR updates the MkDocs navigation structure to match the intended layout discussed in the issue and PR #242.

Changes:

• Adds a single top-level "OpenML Server" nav item pointing directly to index.md
• Removes the separate "Intro" entry to avoid duplicate sidebar items
• Keeps "Getting Started" and "Changes" as separate sidebar items

This ensures only one "OpenML Server" item appears in the sidebar and matches the intended MkDocs Material layout.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 5b702aa and eccee64.

📒 Files selected for processing (1)

• mkdocs.yml

🚧 Files skipped from review as they are similar to previous changes (1)

• mkdocs.yml

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Walkthrough

The mkdocs.yml navigation was updated: the top-level nav label for index.md was renamed from "Intro" to "OpenML Server". Minor formatting changes were added (extra newlines before the Contributing block and before the Changes: migration.md entry). The Changes: migration.md item remains present in the navigation.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: reorganizing the navigation structure to consolidate the intro page into a single top-level OpenML Server nav item.
Description check	✅ Passed	The description is related to the changeset and clearly explains the navigation structure updates, referencing the linked issue and intended layout.
Linked Issues check	✅ Passed	The PR successfully implements the objective from issue #208 by consolidating the intro into a single top-level OpenML Server navigation item, matching the MkDocs Material pattern.
Out of Scope Changes check	✅ Passed	All changes are scoped to the mkdocs.yml file and directly address the navigation structure reorganization objective without introducing unrelated modifications.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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[sourcery-ai]

Hey - I've left some high level feedback:

• The nav reordering moves Changes above the Contributing section (previously it was below); double-check that this new position matches the intended sidebar hierarchy and UX, since the issue description only mentions deduplication, not reordering.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The nav reordering moves `Changes` above the `Contributing` section (previously it was below); double-check that this new position matches the intended sidebar hierarchy and UX, since the issue description only mentions deduplication, not reordering.

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[Copilot]

Pull request overview

This PR resolves issue #208 by restructuring the MkDocs navigation to consolidate the intro page under a single "OpenML Server" top-level navigation item, matching the MkDocs Material design pattern referenced in the issue. The change improves the documentation structure by eliminating duplicate sidebar entries and creating a clearer hierarchy.

Changes:

• Renamed the "Intro" navigation item to "OpenML Server" to serve as the main entry point
• Relocated the "Changes" item to appear before the "Contributing" section for better logical grouping

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