Remove broken Pikchr source code

[spomichter]

No description provided.

[greptile-apps]

Greptile Summary

Removed the Pikchr diagram source code from the ReactiveX documentation while keeping the reference to the generated SVG file. The collapsible <details> section containing the Pikchr source code (19 lines) has been deleted, leaving only the image reference ![output](assets/observable_flow.svg) that displays the observable flow diagram.

Key changes:

• Removed Pikchr source code block wrapped in details/summary tags
• Preserved the SVG file reference to maintain the visual diagram in the documentation
• The generated SVG file at docs/api/sensor_streams/assets/observable_flow.svg still exists and will continue to display correctly

Confidence Score: 5/5

• This PR is completely safe to merge with zero risk
• The change only removes source code documentation while preserving the actual diagram that readers see. The SVG file exists and is correctly referenced. This is a pure documentation cleanup with no functional impact.
• No files require special attention

Important Files Changed

Filename	Overview
docs/api/sensor_streams/reactivex.md	Removed Pikchr diagram source code while keeping the generated SVG reference - clean documentation improvement

Sequence Diagram

sequenceDiagram
    participant Dev as Developer
    participant Docs as Documentation File
    participant Pikchr as Pikchr Source
    participant SVG as Generated SVG
    participant Reader as Documentation Reader

    Dev->>Docs: Identify collapsible Pikchr source
    Note over Docs,Pikchr: Source wrapped in details/summary tags
    Dev->>Pikchr: Remove source code block
    Pikchr--xDocs: Deleted (19 lines)
    Note over Docs: Keep SVG reference intact
    Dev->>Docs: Update file (line 213)
    Docs->>SVG: Reference: ![output](assets/observable_flow.svg)
    Reader->>Docs: View documentation
    Docs->>SVG: Load diagram
    SVG->>Reader: Display observable flow diagram
    Note over Reader: Cleaner docs, same visual result

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[greptile-apps]

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[leshy]

#940 merg this, it fixes those, just the details tag was below the image

[spomichter]

Fixed by #940