Add support for self-hosting

[tobiaslins]

📓 What's in there?

• Rename previously unused token to dsn
• Uses non proxied script when dsn is set and passes dsn to script

[linear[bot]]

ALY-1102 Investigate self-hosting

* Add instruction to the docs PR * Add instruction in front in the appropriate modal

[vercel[bot]]

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Name	Status	Preview	Comments	Updated (UTC)
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