Add agent quickstart docs for all SDK languages - #1333

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  - api-reference/v1-openapi.json
  - api-reference/v2-openapi.json
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  - es/api-reference/v1-openapi.json
  - es/api-reference/v2-openapi.json
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  - es/v0/api-reference/v0-openapi.json
  - es/v1/api-reference/v1-openapi.json
  - es/v1/api-reference/v2-openapi.json
  - fr/api-reference/v1-openapi.json
  - fr/api-reference/v2-openapi.json
  - fr/api-reference/webhooks-openapi.json
  - fr/v0/api-reference/v0-openapi.json
  - fr/v1/api-reference/v1-openapi.json
  - fr/v1/api-reference/v2-openapi.json
  - ja/api-reference/v1-openapi.json
  - ja/api-reference/v2-openapi.json
  - ja/api-reference/webhooks-openapi.json
  - ja/v0/api-reference/v0-openapi.json
  - ja/v1/api-reference/v1-openapi.json
  - ja/v1/api-reference/v2-openapi.json
  - pt-BR/api-reference/v1-openapi.json
  - pt-BR/api-reference/v2-openapi.json
  - pt-BR/api-reference/webhooks-openapi.json
  - pt-BR/v0/api-reference/v0-openapi.json
  - pt-BR/v1/api-reference/v1-openapi.json
  - pt-BR/v1/api-reference/v2-openapi.json
  - v0/api-reference/v0-openapi.json
  - v1/api-reference/v1-openapi.json
  - v1/api-reference/v2-openapi.json
  - zh/api-reference/v1-openapi.json
  - zh/api-reference/v2-openapi.json
  - zh/api-reference/webhooks-openapi.json
  - zh/v0/api-reference/v0-openapi.json
  - zh/v1/api-reference/v1-openapi.json
  - zh/v1/api-reference/v2-openapi.json
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Failed to parse page content at path agent-quickstart/python.mdx: Unexpected character `=` (U+003D) before name, expected a character that can start a name, such as a letter, `$`, or `_`
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