Enhance README with project flowchart

[granjacours697-netizen]

Added a flowchart to illustrate data collection, automation workflows, UI components, and key metrics tracked.graph TB
subgraph Data["Data Collection & Storage"]
A[Ethereum Network] -->|Query Validator State| B[Data Collector]
B -->|Process & Transform| C[historical_data.json]
C -->|Store Historical Records| D[(JSON Database)]
end

subgraph Automation["Automated Workflows"]
    E[GitHub Actions Scheduler] -->|Trigger Updates| F[Update Job]
    F -->|Fetch Latest Data| B
    F -->|Commit Changes| G[Git Repository]
end

subgraph UI["Web Frontend"]
    H[index.html] -->|Display| I[Validator Queue Dashboard]
    J[CSS Styles] --> I
    K[JavaScript Logic] --> I
    C -->|Feed Data| I
end

subgraph Metrics["Key Metrics Tracked"]
    L["🔢 Validator Count"]
    M["📊 Entry Queue Size"]
    N["⏱️ Wait Times"]
    O["📈 Churn Rates"]
    P["💰 Staked Amount"]
end

D -.->|Historical Analysis| I
I -.->|Display| Metrics

style Data fill:#e1f5ff
style Automation fill:#fff3e0
style UI fill:#f3e5f5
style Metrics fill:#e8f5e9

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