Share npm Dependabot configuration across directories

[siddharthkp]

Summary

• use one npm Dependabot configuration for both / and /docs
• check both projects for version updates weekly
• group updates and apply skip changeset consistently across both projects

This ensures docs updates such as #3201 receive the same configuration as root npm updates.

[changeset-bot]

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Latest commit: 9f1ed53

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[Copilot]

Copilot review overview

🟢 Approval recommended

The focused configuration change matches the stated requirements, with no unresolved issues.

Review effort: Balanced
Findings: None

What changed in this PR

Unifies npm Dependabot settings for the root and docs projects so both receive consistent dependency updates.

Changes:

• Adds /docs to the shared npm configuration, reusing grouping and skip changeset labeling.
• Changes npm update checks from daily to weekly.

File	Description
.github/​dependabot.yml	Shares npm update settings across / and /docs on a weekly schedule.

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