lab1(Daha Andrei): Downloaded databases and checked GC score

[AndreiCod]

Summary

• Updated handles
• Run demo scripts to pull dbs and check for GC score and ATG positions
• Solved ex01_multifasta_gc.py and downloaded dbs for future labs

Lab(s) affected

• Lab 01: Intro & Databases

Checklist

• Runs locally (README/Setup followed)
• Notebook outputs cleared (or pre-commit used)
• No large data added to repo
• If MLflow used, runs are reproducible