docs(grpc): title-case headings, replace ASCII diagrams with PNGs, archive older version URLs

[rgsl888prabhu]

Summary

• Normalize all gRPC documentation section titles to proper title case (quick-start, advanced, api, examples, index, grpc-server-architecture)
• Replace ASCII art diagrams in grpc-server-architecture.md with PNG images (grpc-process-model.png, grpc-job-states.png)
• Increase gRPC toctree maxdepth from 2 to 4 in index.rst for better sidebar navigation
• Update versions1.json: older release version URLs moved from docs.nvidia.com to archive.docs.nvidia.com

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Reviewing files that changed from the base of the PR and between f982353 and 52c2e5f.

📒 Files selected for processing (1)

• docs/cuopt/source/versions1.json

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

• docs/cuopt/source/versions1.json

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📝 Walkthrough

Walkthrough

This PR standardizes CUOpt documentation by updating section heading capitalization to title-case across multiple gRPC documentation files, replacing ASCII diagrams with image references in architecture documentation, and updating documentation metadata and historical version URLs for consistency.

Changes

Documentation Standardization

Layer / File(s)	Summary
gRPC documentation heading standardization cpp/docs/grpc-server-architecture.md, docs/cuopt/source/cuopt-grpc/advanced.rst, docs/cuopt/source/cuopt-grpc/api.rst, docs/cuopt/source/cuopt-grpc/examples.rst, docs/cuopt/source/cuopt-grpc/index.rst, docs/cuopt/source/cuopt-grpc/quick-start.rst	All section headings are updated to use consistent title-case capitalization (e.g., "Quick start" → "Quick Start", "How remote execution works" → "How Remote Execution Works", "Further reading" → "Further Reading"), creating uniform formatting across the gRPC documentation suite.
Architecture documentation diagram replacement docs/cuopt/source/cuopt-grpc/grpc-server-architecture.md	ASCII/text diagrams for process model and job states are replaced with referenced image assets (images/grpc-process-model.png and images/grpc-job-states.png), reducing document line count while maintaining the same informational content.
Documentation structure and version updates docs/cuopt/source/index.rst, docs/cuopt/source/versions1.json	Main documentation index toctree maxdepth is increased from 2 to 4 with heading capitalization standardized, and historical version documentation URLs are redirected from the live host to the archive host for versions 26.04.00 through 24.11.

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🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main changes: title-casing headings, replacing ASCII diagrams with PNGs, and updating archived version URLs.
Description check	✅ Passed	The description is clearly related to the changeset, providing specific details about title-casing updates, diagram replacements, toctree depth changes, and URL migrations.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

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

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Actionable comments posted: 1

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Verify each finding against current code. Fix only still-valid issues, skip the
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Inline comments:
In `@docs/cuopt/source/versions1.json`:
- Around line 14-42: Update the entry with "version": "25.05" in versions1.json
to use the archived path that returns 200: change the "version" value to
"25.05.00" (or the full version string your switcher expects) and update its
"url" from "https://archive.docs.nvidia.com/cuopt/user-guide/25.05/" to
"https://archive.docs.nvidia.com/cuopt/user-guide/25.05.00/"; ensure the
modified object (the one containing the "version" and "url" keys for 25.05)
matches the format of the surrounding entries so the version switcher resolves
correctly.

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Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
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📥 Commits

Reviewing files that changed from the base of the PR and between 9142298 and f982353.

⛔ Files ignored due to path filters (2)

• docs/cuopt/source/cuopt-grpc/images/grpc-job-states.png is excluded by !**/*.png
• docs/cuopt/source/cuopt-grpc/images/grpc-process-model.png is excluded by !**/*.png

📒 Files selected for processing (9)

• cpp/docs/grpc-server-architecture.md
• docs/cuopt/source/cuopt-grpc/advanced.rst
• docs/cuopt/source/cuopt-grpc/api.rst
• docs/cuopt/source/cuopt-grpc/examples.rst
• docs/cuopt/source/cuopt-grpc/grpc-server-architecture.md
• docs/cuopt/source/cuopt-grpc/index.rst
• docs/cuopt/source/cuopt-grpc/quick-start.rst
• docs/cuopt/source/index.rst
• docs/cuopt/source/versions1.json