docs: document remote connector MCP URL and use mcp.postiz.com

[giladresisi]

Adds a "Claude.ai and ChatGPT (remote connectors)" section to mcp/setup.mdx with the URL from Settings > MCP Client Configuration (https://mcp.postiz.com/mcp/YOUR_API_KEY, no OAuth), plus a warning that the keyless URL fails in those clients with an OAuth registration error.

Also aligns every MCP URL in mcp/setup.mdx and mcp/introduction.mdx with the dashboard: mcp.postiz.com instead of api.postiz.com.

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Reviewing files that changed from the base of the PR and between 1b731f2 and 28c2633.

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• mcp/introduction.mdx
• mcp/setup.mdx

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