docs: add transformers page

[mrlubos]

Merge after #670 @Nick-Lucas

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Latest commit: 3e72eb515d435d9f5f3dfe1173f2126d5e665b13

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Name	Status	Preview	Comments	Updated (UTC)
hey-api-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 16, 2024 4:19pm

[mrlubos]

@Nick-Lucas let me know if you want to change anything here

[Nick-Lucas]

Looks great, ship it!