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 changes that add new guide pages and reorder/rename sidebar sections, with no runtime code impact.

Overview
Adds three new AI-focused guide pages—ai-sdk, integration-with-langchain, and mcp-server—and links them from the newly renamed Integrations sidebar section.

Reorganizes the guide sidebar by moving the former Overview links into a new About section near the bottom and adjusting section ordering (with Getting started immediately after Introduction).

^{Written by Cursor Bugbot for commit 787b8bc. This will update automatically on new commits. Configure here.}

[github-actions]

Performance comparison of head (787b8bc) vs base (0c1d130)

                                     testName |   base |   head |  change
-------------------------------------------------------------------------
                                      Sheet A | 507.46 | 503.02 |  -0.87%
                                      Sheet B | 166.18 | 161.36 |  -2.90%
                                      Sheet T | 142.99 | 141.13 |  -1.30%
                                Column ranges | 512.74 | 527.97 |  +2.97%
Sheet A:  change value, add/remove row/column |  15.01 |  18.11 | +20.65%
 Sheet B: change value, add/remove row/column |  135.2 | 147.27 |  +8.93%
                   Column ranges - add column | 154.04 |    166 |  +7.76%
                Column ranges - without batch | 475.95 | 494.43 |  +3.88%
                        Column ranges - batch | 128.24 | 127.38 |  -0.67%

[sequba]

Nice 👍 Simple and quickly shippable

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.18%. Comparing base (0c1d130) to head (787b8bc).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1644      +/-   ##
===========================================
+ Coverage    96.98%   97.18%   +0.20%     
===========================================
  Files          172      172              
  Lines        14878    14878              
  Branches      3273     3174      -99     
===========================================
+ Hits         14429    14459      +30     
+ Misses         449      419      -30     

see 1 file with indirect coverage changes

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