Add Better Stack dashboard template steps

[shaaza]

Summary

• document how to import a default Better Stack dashboard using step-by-step instructions

Testing

• npm i -g mintlify (fails: 403 Forbidden)
• mintlify broken-links (fails: command not found)
• Codex couldn't run certain commands due to environment limitations. Consider configuring a setup script or internet access in your Codex environment to install dependencies.

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https://chatgpt.com/codex/tasks/task_b_684970f019d0832da4333c16b1172984