Add PostHog server configuration to MCP setup

[hannesrudolph]

Important

Add PostHog server configuration to .roo/mcp.json using npx and environment variables.

• Configuration:
  • Adds posthog server configuration to .roo/mcp.json.
  • Uses npx to run mcp-remote@latest with URL https://mcp.posthog.com/sse.
  • Sets Authorization header using POSTHOG_AUTH_HEADER.
  • Defines POSTHOG_AUTH_HEADER as Bearer ${env:POSTHOG_PERSONAL_ACCESS_TOKEN}.

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