docs: add agent quickstart pages for all SDK languages - #1263

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  - api-reference/v1-openapi.json
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  - api-reference/webhooks-openapi.json
  - es/api-reference/v1-openapi.json
  - es/api-reference/v2-openapi.json
  - es/api-reference/webhooks-openapi.json
  - es/v0/api-reference/v0-openapi.json
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  - 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
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  - ja/api-reference/v1-openapi.json
  - ja/api-reference/v2-openapi.json
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  - 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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