Add AI integration docs and reorganize sidebar

[GreenFlux]

Summary

• Add three new landing pages under Framework integration: HyperFormula AI SDK, Integration with LangChain/LangGraph, and HyperFormula MCP Server
• Rename sidebar "Overview" section to "About" and move it above Miscellaneous (2nd to last)
• Promote "Getting started" to second position in sidebar (right after Introduction)

Test plan

• Run npm run docs:dev and verify sidebar order: Introduction → Getting started → Framework integration → ... → About → Miscellaneous
• Verify new pages render at /guide/ai-sdk, /guide/integration-with-langchain, /guide/mcp-server
• Verify existing Overview pages (Quality, Supported browsers, etc.) still accessible at original URLs

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Note

Low Risk
Low risk documentation-only change that updates navigation and adds new guide pages; main risk is broken/incorrect sidebar links or ordering in VuePress.

Overview
Adds three new guide landing pages for AI-related integrations—/guide/ai-sdk, /guide/integration-with-langchain, and /guide/mcp-server—and links them under Framework integration in the docs sidebar.

Reorganizes the guide sidebar by moving the former Overview links into a renamed About section placed near the end (just before Miscellaneous), without changing the underlying page URLs.

^{Written by Cursor Bugbot for commit a711691. This will update automatically on new commits. Configure here.}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.18%. Comparing base (72db14b) to head (a711691).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1644      +/-   ##
===========================================
- Coverage    97.18%   97.18%   -0.01%     
===========================================
  Files          172      172              
  Lines        14845    14878      +33     
  Branches      3264     3273       +9     
===========================================
+ Hits         14427    14459      +32     
- Misses         418      419       +1     

see 18 files with indirect coverage changes

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[github-actions]

Performance comparison of head (a711691) vs base (0c1d130)

                                     testName |   base |   head | change
------------------------------------------------------------------------
                                      Sheet A | 504.49 |    507 | +0.50%
                                      Sheet B | 164.52 | 163.97 | -0.33%
                                      Sheet T | 146.99 | 143.52 | -2.36%
                                Column ranges | 483.97 | 477.02 | -1.44%
Sheet A:  change value, add/remove row/column |  16.93 |  16.48 | -2.66%
 Sheet B: change value, add/remove row/column | 146.23 | 139.98 | -4.27%
                   Column ranges - add column | 154.22 | 157.27 | +1.98%
                Column ranges - without batch | 474.01 | 467.63 | -1.35%
                        Column ranges - batch | 116.87 | 120.79 | +3.35%