adds more advanced database handling unsing sql alchemy

- moves app into package
- adds sql alchemy equipment
- moves templates into server package
- add app.db sqlite file

database/user.py

@@ -1,7 +1,7 @@
 from flask_login import UserMixin
 from pathlib import Path
 
-from database.db import get_db
+from server.database.db import get_db
 
 class User(UserMixin):
     def __init__(self, id_, name, email, profile_pic):