✅ Changed file structure, extraction endpoints added resolve #43 reso…

Created by: Srikar-V675

…lve #35 (closed) resolve #22 (closed) resolve #13 (closed)

Changes made:

• changed the strcuture: cannot open `strcuture' (No such file or directory)
• implemented and endpoints to extraction APIs
• implmented the scraping by -> and for
• solved bugs
• decided to drop threading because of multiple problems in extraction table updating and no enhancement of execution time
• implemented extractions table which updates every 5 students scraped which can serve as progress bar tracker in frontend
• implemented extraction scraper as a background task allowing for multiple requests