build: create script for processing include statements in docs

[dslovinsky]

Context

!include statements to directly reference code in docs snippets is a vocs feature that Fern doesn't support. Fern has told us to just remove the references and maintain the code snippets directly in MDX. But fuck that

Tada 🎉 , working !include statements. No MDX file changes necessary.

Before:

After:

Pull Request Checklist

• Did you add new tests and confirm existing tests pass? (yarn test)
• Did you update relevant docs? (docs are found in the site folder, and guidelines for updating/adding docs can be found in the contribution guide)
• Do your commits follow the Conventional Commits standard?
• Does your PR title also follow the Conventional Commits standard?
• If you have a breaking change, is it correctly reflected in your commit message? (e.g. feat!: breaking change)
• Did you run lint (yarn lint:check) and fix any issues? (yarn lint:write)
• Did you follow the contribution guidelines?

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PR-Codex overview

This PR introduces a new GitHub Action to extract code snippets from specified files and updates documentation to include instructions for using these snippets.

Detailed summary

• Added a new step in .github/actions/setup-docs/action.yml to extract code snippets using a script.
• Updated docs/README.md to clarify how to generate SDK references and introduced a section on injected code snippets.
• Created docs/scripts/extract-include-statements.js to find and replace [!include] statements in .mdx files with actual code content.

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[github-actions]

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