Stream docs

[svix-gabriel]

Stream docs (#226)
This closes https://github.com/svix/monorepo-private/issues/9127
alongside https://github.com/svix/svix-webhooks-private/pull/4526

The docs try to explain high level concepts (what is a Stream, Sink,
Event Types, Events), the semantics of dispatch (retries, batching), and
transformations.

To review:

• pull down the changes locally
• run yarn start and navigate to the Stream section.

The screenshots, side by side with the text, are pretty integral to the
flow of the documentation. So it's better to read them side by side.

Random things to note:

• There are some plaintext authtoken looking things, these are from fake
  or revoked tokens, so they're fine to include in source code.
• In quite a few places, we link to the API docs for stream. However,
  these docs won't be public until
  https://github.com/svix/svix-webhooks-private/pull/4526 is merged, so
  the links may not work when clicking locally.

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Project	Deployment	Preview	Comments	Updated (UTC)
svix-docs	Ready	Preview	Comment	Oct 8, 2025 3:39pm

[svix-lucho]

In case you can't access Vercel

  [cause]: Error: Docusaurus found broken links!
  
  Please check the pages of your site in the list below, and make sure you don't reference any path that does not exist.
  Note: it's possible to ignore broken links with the 'onBrokenLinks' Docusaurus configuration, and let the build pass.
  
  Exhaustive list of all broken links found:
  - Broken link on source page path = /stream/event-types/introduction:
     -> linking to ./sinks/intro_to_sinks (resolved as: /stream/event-types/sinks/intro_to_sinks)
  - Broken link on source page path = /stream/introduction:
     -> linking to ./sink-types/http (resolved as: /stream/sink-types/http)
     -> linking to ./sink-types/s3 (resolved as: /stream/sink-types/s3)
     -> linking to ./sink-types/gcs (resolved as: /stream/sink-types/gcs)
     -> linking to ./sink-types/azure_blob (resolved as: /stream/sink-types/azure_blob)
     -> linking to ./sink-types/otel_trace (resolved as: /stream/sink-types/otel_trace)
  - Broken link on source page path = /stream/sinks/introduction:
     -> linking to ../sink-types/http (resolved as: /stream/sink-types/http)
     -> linking to ../sink-types/otel_trace (resolved as: /stream/sink-types/otel_trace)
     -> linking to ../sink-types/s3 (resolved as: /stream/sink-types/s3)
     -> linking to ../sink-types/gcs (resolved as: /stream/sink-types/gcs)
     -> linking to ../sink-types/azure_blob (resolved as: /stream/sink-types/azure_blob)
     -> linking to ../sink-types/poller (resolved as: /stream/sink-types/poller)