docs: add db.gds and db.search to quickstart, tutorial, and guide overview

[DecisionNerd]

Summary

The quickstart, tutorial, and guide overview didn't mention db.gds or db.search at all. This PR adds them.

• quickstart.md — Graph Algorithms and Hybrid Search sections with minimal working examples
• tutorial.md — Full db.gds section (PageRank, Louvain, betweenness, algorithm table) and db.search section (text, vector, hybrid, SearchHit → Cypher round-trip)
• guide/overview.md — Analytics Integration, db.gds, and db.search entries in the Topics list

Test plan

• mkdocs build --strict clean
• make pre-push-fast clean

🤖 Generated with Claude Code

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[coderabbitai]

Important

Review skipped

Review was skipped due to path filters

⛔ Files ignored due to path filters (3)

• docs/getting-started/quickstart.md is excluded by !**/*.md, !**/docs/**
• docs/getting-started/tutorial.md is excluded by !**/*.md, !**/docs/**
• docs/guide/overview.md is excluded by !**/*.md, !**/docs/**

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/v040-guide-updates

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.81%. Comparing base (586ff9b) to head (1d104d4).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #544   +/-   ##
=======================================
  Coverage   83.81%   83.81%           
=======================================
  Files          47       47           
  Lines       12647    12647           
  Branches     3587     3587           
=======================================
  Hits        10600    10600           
  Misses       1265     1265           
  Partials      782      782           

Flag	Coverage Δ
full-coverage	83.81% <ø> (ø)

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Components	Coverage Δ
parser	92.93% <ø> (ø)
planner	79.90% <ø> (ø)
executor	75.46% <ø> (ø)
storage	98.68% <ø> (ø)
ast	97.51% <ø> (ø)
types	90.66% <ø> (ø)

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