added cm org instructions

[PavelLinearB]

✨ PR Description

Purpose: This PR updates documentation to improve clarity and accuracy of gitStream configuration instructions for GitHub installations.

Main changes:

• Corrects links to trigger configuration documentation
• Clarifies setup instructions for GitHub Server installations
• Adds guidance for setting up gitStream across multiple GitHub organizations

Generated by LinearB AI and added by gitStream.
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[orca-security-us]

Orca Security Scan Summary

Status	Check	Issues by priority
Passed	Infrastructure as Code	0   0   0   0	View in Orca
Passed	Secrets	0   0   0   0	View in Orca
Passed	Vulnerabilities	0   0   0   0	View in Orca

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Comments suppressed due to low confidence (2)

docs/context-variables.md:36

• Ensure that the updated anchor '#gitblame-structure' correctly corresponds with the actual header in the GitBlame section to prevent broken links.

+ [`GitBlame`](#gitblame-structure)

docs/cm-file.md:24

• Verify that the new anchor '#triggers-section' in execution-model.md matches the intended header; if not, update the link anchors to the correct section title.

You can select (include or exclude) certain repositories per automation file using the [`triggers.include.repository`](./execution-model.md#triggers-section) and [`triggers.exclude.repository`](./execution-model.md#triggers-section)