[Agents] Add tutorial for Slackbot

[harshil1712]

Summary

Adds a tutorial on building AI powered Slackbot using the Agents SDK.

Documentation checklist

• The documentation style guide has been adhered to.

[hyperlint-ai]

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PR Change Summary

Added a comprehensive tutorial for building an AI-powered Slackbot using the Agents SDK, enhancing the documentation for developers.

• Introduced a new tutorial on creating a Slackbot with the Agents SDK.
• Included prerequisites and step-by-step instructions for building the Slackbot.
• Added code examples for handling Slack events and creating an agent.
• Documented the process for deploying the Slackbot to Cloudflare Workers.

Added Files

• src/content/docs/agents/tutorials/index.mdx
• src/content/docs/agents/tutorials/slackbot-knowledgebase/index.mdx

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[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/src/content/docs/agents/	@irvinebroque, @rita3ko, @elithrar, @thomasgauvin, @threepointone, @cloudflare/pcx-technical-writing

[github-actions]

Preview URL: https://6e666818.preview.developers.cloudflare.com
Preview Branch URL: https://slackbot-agents.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/agents/tutorials/slackbot-knowledgebase/	https://slackbot-agents.preview.developers.cloudflare.com/agents/tutorials/slackbot-knowledgebase/
https://developers.cloudflare.com/agents/tutorials/	https://slackbot-agents.preview.developers.cloudflare.com/agents/tutorials/