Implement question answering flow for courses

[terror]

We'd have to think of where to put this if feasible at all, but what if we were able to fully index a course and all its reviews, allowing us to ask question about all of them, such as:

• Show me computer science courses that have recorded lectures
• What are the easiest math courses
• Which courses depend on Introduction to Biophysics

...etc

[terror]

We'll use this for the RAG setup https://www.mongodb.com/products/platform/atlas-vector-search

Our primary data sources will be:

• Reddit posts, comments (w/ replies) from r/mcgill
• E-calendar course data, e.g. course titles, descriptions, etc
• Reviews from our own prod db, this is a combination of reviews scraped from rmp and our own platform-native reviews from our users

We should pick an LLM (like deepseek, 4o) that supports structured output, we'll want relevant URLs pairs with answers so we can display them nicely to the client.