Summary: StellarPeers adds Product Testing framework

Why It Matters: The competitor is expanding its curriculum to cover more specific interview types. This helps them attract candidates who need help with technical execution questions rather than just creative brainstorming.

What Changed:

• Removed the "Brainstorming" framework section from the main list.
• Added a new "Product Testing" framework section.
• Added a description for the new framework: "A framework to explain how you would test a feature."
• Updated the footer social media link.