docs: add adapters section in docs

[paul-cayet]

Context

We need a dedicated section in the docs for adapters, with one page for each adapter showing how to use it (e.g., to be able to link to it from the langchain/langgraph docs)

Changes

Main changes

• New adapters section in the docs

Other changes

• Fixes to CrewAI adapter
• Import update as adapters have moved inside pyagentspec

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[nasseur]

Internal regression failed: Build ID #43

[nasseur]

Internal regression failed: Build ID #44

[nasseur]

Internal regression failed: Build ID #46

[nasseur]

Internal regression succeeded 🍏: Build ID #48

[sonleoracle]

Thank you for your PR!

[nasseur]

Merge Gate INPROGRESS

[nasseur]

Internal regression succeeded 🍏: Build ID #279

[nasseur]

Merge Gate succeeded 🍏: Build ID #420