[PRO-72] Portal: Update hero subtext (#8292)

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## PR-Codex overview

This PR updates the content of a paragraph in the `page.tsx` file to reflect a new description of the platform, enhancing its messaging and presentation.

### Detailed summary

- Changed the text within a `<p>` tag:
    - From: "Development framework for building onchain apps, games, and agents."
    - To: "Platform for building the next generation of internet products."
- Adjusted the class name from `max-w-md` to `max-w-lg` and added `text-pretty`.

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<!-- This is an auto-generated comment: release notes by coderabbit.ai -->

## Summary by CodeRabbit

* **Style**
  * Updated hero section messaging to better reflect the platform's positioning and capabilities.
  * Enhanced text layout and formatting for improved readability on the homepage.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: MananTank

apps/portal/src/app/page.tsx

@@ -48,8 +48,8 @@ function Hero() {
           <h1 className="mb-3 font-bold text-4xl tracking-tighter lg:text-6xl">
             thirdweb Documentation
           </h1>
-          <p className="mb-8 max-w-md text-lg text-muted-foreground leading-normal">
-            Development framework for building onchain apps, games, and agents.
+          <p className="mb-8 max-w-lg text-lg text-muted-foreground leading-normal text-pretty">
+            Platform for building the next generation of internet products
           </p>
           <div className="flex gap-3">
             <ChatButton />