fix(docs): update redirects rule to resolve access issue on `getting-started` index page (#10296)
### Description
This PR fixes a redirection issue where clicking the **“Next: Getting
Started”** button at the bottom of the **Introduction** page in the
Turborepo docs incorrectly navigates back to the Introduction page.
The root cause is a redirect rule defined in `next.config.ts` that
overrides the expected navigation.
To resolve this, the conflicting `redirects` rule has been removed to
allow proper access to the Getting Started index page.
### Testing Instructions
1. Clone this PR locally and run the project.
2. Navigate to the **Introduction** page in the documentation.
3. Click on the **“Next: Getting Started”** button at the bottom.
4. Verify that it correctly navigates to the **Getting Started** index
page instead of redirecting back to **Introduction**.
Co-authored-by: Anthony Shew <anthony.shew@vercel.com>