feat: Add chatgpt and Agents SDK integration

[jirispilka]

feat: Add chatgpt.md and Agents SDK integration guides

close: https://github.com/apify/ai-team/issues/102

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[TC-MO]

I'll let @marcel-rbro (our new Technical Writer) handle this one to get him warmed up

[jirispilka]

Cool! Thanks

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