Summary: GitHub adds MCP Registry integration

Why It Matters: This change shows GitHub is adding new ways for developers to connect tools.

What Changed:

• The "Last chance: Save $400 on Universe passes, only until 9/17. Register now" banner changed to "Explore 100+ talks, demos, and workshops at Universe 2025. Choose your favorites."
• A new link for "MCP Registry" was added under "Integrations" in the main navigation.
• A new link for "App Modernization" was added under "By use case" in the main navigation.
• The "Partners" link under "Resources" in the main navigation changed its URL.
• The "GitHub Marketplace" link was moved from "Integrations" to "Ecosystem" in the site-wide links section.
• A new link for "MCP Registry" was added under "Ecosystem" in the site-wide links section.
• The pricing for "GitHub Secret Protection" changed from "$19 USD per active committer/month" to "$19 USD".
• The order of the "Strengthen your development with AI" and "Empower your team with native AppSec" sections was swapped, and their headings were changed to be part of the main text.
• A new "Explore" section with four suggestions (Enterprise, Security, Copilot, Pricing) was added below the search bar.