Clarify FAQ: BYOK works without GitHub Copilot subscription

[lossyrob]

The FAQ incorrectly stated that a GitHub Copilot subscription is always required. BYOK (Bring Your Own Key) users can use the SDK with their own LLM provider credentials (Azure AI Foundry, OpenAI, Anthropic) without GitHub authentication.

Changes

• Updated first FAQ answer to explicitly call out BYOK exception
• Clarified free tier applies to standard (non-BYOK) usage only

Example BYOK Usage (No GitHub Auth Required)

import { CopilotClient } from "@github/copilot-sdk";

const client = new CopilotClient({ useLoggedInUser: false });
await client.start();

const session = await client.createSession({
  model: "gpt-4",
  provider: {
    type: "azure",
    baseUrl: "https://your-endpoint.openai.azure.com"
  }
});

Note: Generated with Copilot coding agent

[Copilot]

Pull request overview

This PR clarifies the FAQ to address confusion about subscription requirements for BYOK (Bring Your Own Key) users. The change explains that while a GitHub Copilot subscription is normally required, users can bypass this requirement by using BYOK with their own LLM provider credentials.

Changes:

• Updated the subscription FAQ answer to explicitly state the BYOK exception to GitHub authentication requirements
• Clarified that the free tier and pricing information applies only to standard (non-BYOK) usage

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