docs: Update setup docs

[tianjing-li]

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AI Description

This PR introduces several changes to the Cohere Toolkit documentation, focusing on setup instructions, tool authentication, and configuration.

Setup Instructions:

• README.md: The local setup instructions now include the installation of Poetry alongside Docker and Docker Compose.
• docs/setup.md: The setup guide has been restructured, with a new section for installing Poetry, Docker, and Docker Compose. The manual configuration section has been updated to mention the secrets.yaml file and provide specific environment variable names.

Tool Authentication:

• docs/custom_tool_guides/tool_auth_guide.md: The tool authentication guide now suggests creating an authentication class, providing examples from GMail, GDrive, and Slack. It also clarifies that the auth_implementation should be added to the tool's get_tool_definition method.

Configuration:

• docs/setup.md: The environment variable configuration section has been updated to mention secrets.yaml and provide specific variable names for cohere_platform.api_key, database.url, and redis.url.
• src/backend/config/configuration.template.yaml: The configuration template now includes 'brave_web_search' in the list of web search tool names.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.91%. Comparing base (fc64a71) to head (a7a583b).

Additional details and impacted files

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  Misses       2462     2462           

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[EugeneLightsOn]

Thank you, I leave some notes

[EugeneLightsOn]

line 55 - Do we need to include all available tools to this list?
line 68 - Coming soon: Support for tools that require authentication. - Already implemented for GMail, GDrive and Slack tools.