[NODE] Add Widget Message Send documentation

[ShambaC]

Node Config

{
    title: "Send Widget Response",
    category: "output",
    type: "widget_msg_send",
    icon: {},
    desc: "Send a response to your support bot widget",
    inputs: [
        {
            desc: "The flow of the workflow",
            name: "Flow",
            type: "Flow",
        },
        {
            desc: "Text to send",
            name: "Message",
            type: "Text",
        },
    ],
    outputs: [
        {
            desc: "The final output object of chat bot",
            name: "Result",
            type: "JSON"
        },
    ],
    fields: [
        {
            desc: "Text to send",
            name: "Message",
            type: "TextArea",
            value: "text here ...",
        },
    ],
    difficulty: "easy",
    tags: ["output", "support", "bot", "widget"],
}

Additional Information

Long Description:
Send a response to your widget corresponding to the workflow that has the chat trigger.

Use Cases:

• Send a message to use the widget as a normal chat window for your agent
• Send confirmation messages
• Send information from your workflow to the UI
• Send messages to a customer and use the widget for customer support.

[github-actions]

✅ Documentation processed successfully!

A pull request has been created: #24

The node documentation will be reviewed and merged if everything looks correct.