docs: replace broken !include statements to shared TS files

[dslovinsky]

Context:

[!include <filename>] is vocs syntax that doesn't work in Fern docs. Their code snippets don't allow for importing TS files directly into code snippets. This workaround uses Fern's Markdown component to import a MDX file instead which has a similar effect and should work once Fern implements twoslash.

Notes for Reviewers:

• This does NOT address !include statements that import files from other aa-sdk repos. That will be done separately.
• Twoslash support is not added yet, so pages containing those code snippets have broken MDX parsing
• Unfortunately that means these changes can't be tested with preview links - you'd need to check locally

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?

---

PR-Codex overview

This PR focuses on converting TypeScript files to Markdown files across various documentation pages, particularly for signer, config, and client related content. It replaces include statements with Markdown imports to enhance documentation clarity and accessibility.

Detailed summary

• Deleted TypeScript files: signer.ts, account-provider-setup.tsx, supported-permissions.ts.
• Converted config.ts, ssr-config.ts, client.ts, and others to .mdx format.
• Replaced // [!include ...] statements with <Markdown src="..."/> in multiple .mdx files.
• Updated paths in various documentation files to point to new .mdx files for better modularity and readability.

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