Enhance curriculum structure and add new subjects: Update CONTRIBUTING.md with detailed guidelines for adding new subjects and their associated assets. Introduce English and Physics subjects in the catalog, along with their respective curriculum files and chapter structures. Implement shared styles for English and Physics chapters, and add interactive widgets for physics concepts. Update FAQ to clarify the use of AI in content creation, ensuring accessibility and durability of educational materials.

data/faq.json

@@ -97,8 +97,9 @@
       "type": "standard",
       "question": "Is the content AI-generated?",
       "answer": [
-        "No. Chapters are authored HTML with care: figures, interactives, and maps where they help understanding — not bulk-generated slop or print PDFs pasted online.",
-        "Core curriculum changes slowly; one carefully reviewed book, shared openly, beats regenerating the same chapter thousands of times in a data center."
+        "We use AI as a drafting and editing tool, but we do not rely on AI chat tokens as the final product layer. We publish reviewed, hand-curated chapters as open HTML so learning materials stay readable without paid AI access.",
+        "Token costs matter. Today some companies appear to offer \"free\" AI access, but that is often market-share strategy in an early stage. If prices rise later, learners with less money or weaker infrastructure could lose access.",
+        "The open web is more durable: HTML and JavaScript are stable foundations likely to remain usable for decades. Building high-quality, future-proof educational materials now — with AI assistance but web-native outputs — is the practical long-term approach."
       ]
     },
     {