fix: disable ppr in auth pages to make them SSG

[jorgemoya]

What/Why?

Disables ppr by export const experimental_ppr = false; since there are no dynamic elements in these pages.

Before

After

Testing

Locally, behavior works the same, but during build time the page is SSG.

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[github-actions]

⚡️🏠 Lighthouse report

Lighthouse ran against https://catalyst-canary-nhwwo8g9o-bigcommerce-platform.vercel.app

🖥️ Desktop

We ran Lighthouse against the changes on a desktop and produced this report. Here's the summary:

Category	Score
🟢 Performance	99
🟢 Accessibility	92
🟠 Best practices	78
🟠 SEO	82

📱 Mobile

We ran Lighthouse against the changes on a mobile and produced this report. Here's the summary:

Category	Score
🟠 Performance	86
🟢 Accessibility	92
🟠 Best practices	78
🟠 SEO	85