index now retrieves tools in a random order

web/app/main.py

 from flask_login import login_required, current_user
 from . import db
 from .models import Tool
+from sqlalchemy.sql import func
+from sqlalchemy.orm import load_only
 
 main = Blueprint('main', __name__)
 
 # route for index page
 @main.route('/')
 def index():
-    tools = Tool.query.limit(3)
+    tools = Tool.query.order_by(func.random()).limit(5).all()
     return render_template('index.html', tools=tools)
 
 # route for profile page