remove README_installation.md and old module docs

[paul-nechifor]

• Can cause confusion.

[greptile-apps]

Greptile Overview

Greptile Summary

Removed outdated documentation files that have been superseded by updated versions in the main repository.

• Removed README_installation.md - installation instructions now consolidated in the main README.md
• Removed docs/old/modules.md - module documentation migrated to docs/concepts/modules.md
• Removed docs/old/modules_CN.md - Chinese translation of outdated module documentation

The references to modules documentation in other files (README.md, docs/concepts/transports.md, docs/depth_camera_integration.md) correctly point to the new location at docs/concepts/modules.md, confirming the migration was completed before this cleanup.

Confidence Score: 5/5

• This PR is safe to merge with no risk
• This is a documentation cleanup PR that only removes outdated files. The replacement documentation already exists and is correctly referenced throughout the codebase. No code changes, no breaking changes, and no references to the removed files remain.
• No files require special attention

Important Files Changed

Filename	Overview
README_installation.md	Removed obsolete installation documentation that has been superseded by the main README.md
docs/old/modules.md	Removed outdated module documentation that has been replaced by docs/concepts/modules.md
docs/old/modules_CN.md	Removed Chinese translation of outdated module documentation

Sequence Diagram

sequenceDiagram
    participant Dev as Developer
    participant PR as Pull Request
    participant Repo as Repository
    
    Dev->>PR: Remove README_installation.md
    Note over Dev,PR: Obsolete installation docs
    Dev->>PR: Remove docs/old/modules.md
    Note over Dev,PR: Outdated module documentation
    Dev->>PR: Remove docs/old/modules_CN.md
    Note over Dev,PR: Chinese translation of old docs
    PR->>Repo: Clean up documentation
    Note over Repo: Current docs:<br/>- README.md (installation)<br/>- docs/concepts/modules.md

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