docs: Update kickstart URL to canonical get.netdata.cloud

[Ancairon]

Summary

This PR resolves a documentation inconsistency by updating the kickstart installation URL to use the canonical https://get.netdata.cloud/kickstart.sh instead of https://my-netdata.io/kickstart.sh.

Changes

• Updated docs/getting-started-netdata/guide.md - Replaced kickstart URL in installation command
• Updated docs/learn/unclaim-reclaim-node.md - Replaced kickstart URL in reclaim command

Context

The installation documentation was using different kickstart URLs across different files. The OneLineInstall component uses get.netdata.cloud while the Getting Started guide used my-netdata.io. This PR standardizes all documentation to use the canonical URL for consistency.

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Summary by cubic

Standardizes the kickstart install URL to https://get.netdata.cloud/kickstart.sh across docs for consistency with OneLineInstall and to avoid confusion. Updates the Getting Started guide and the Unclaim/Reclaim guide.

^{Written for commit 5283f5a. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 2 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

Architecture diagram

sequenceDiagram
    participant User as User/Admin
    participant Docs as Netdata Documentation
    participant Canonical as get.netdata.cloud (CDN)
    participant Node as Target System
    participant Cloud as Netdata Cloud

    Note over User,Cloud: Installation / Reclaim Flow

    User->>Docs: Access installation or reclaim guides
    Docs-->>User: Display command with canonical URL
    
    User->>Node: Paste and execute installation command
    
    Node->>Canonical: CHANGED: curl -Ss https://get.netdata.cloud/kickstart.sh
    Canonical-->>Node: Return kickstart.sh script

    Node->>Node: Execute kickstart.sh
    Node->>Canonical: Fetch Netdata Agent packages/binaries
    Canonical-->>Node: Return Agent software

    Node->>Node: Install and start Netdata Agent
    
    opt Claiming Node
        Node->>Cloud: Claim node using --claim-token
        Cloud-->>Node: Confirm connection (UUID assigned)
    end

    Note over Node,Cloud: Node is now visible in Netdata Cloud UI

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