added examples to skip API calls and use pre-post-processing

[wkande]

closes #1118

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Visit the preview URL for this PR (updated for commit d289355):

https://api3-docs--pr1179-20230131-1118-ois-sk-a5t5tufj.web.app

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[amarthadan]

Can you also update the reference in the Migration guide? https://api3-docs--pr1179-20230131-1118-ois-sk-a5t5tufj.web.app/airnode/v0.10/reference/migration.html#new-features