Summary: AskYourPDF adds multi-document chat capability

Why It Matters: The product is moving from simple single-file summaries to a "Knowledge Base" model. This allows users to connect information across many different files at the same time.

What Changed:

• Changed the primary call-to-action from generating summaries to chatting with multiple documents at once.
• Updated the main headline link from the "summarise" page to a new "documents" knowledge base page.
• Updated the hero section text to focus on saving study time and breaking down dense textbooks.
• Added a specific mention of using a "Knowledge Base" for document interaction.