remove site requirement from netlify adapter

[FredKSchott]

Changes

• remove the requirement for site config by using event.rawUrl
• also, added handling for body while I was there
• I can't believe this event API isn't better documented!

Testing

• Verified locally

Docs

• N/A

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Latest commit: de69ed4

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[matthewp]

Lgtm, didn't know rawUrl was a thing

[FredKSchott]

also: this fixes an issue where query params were being stripped