Remove obsolete configuration files from n8n sample-agent (#208)

* Initial plan

* Remove docs folder and .env.template from n8n sample-agent

Co-authored-by: rbrighenti <202984599+rbrighenti@users.noreply.github.com>

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: rbrighenti <202984599+rbrighenti@users.noreply.github.com>

Author: Copilot