Add seed to the graph generator

Gragh changed every time it was clicked, add seed to fix G

app.py

@@ -29,7 +29,7 @@ from streamlit_agraph import agraph, Node, Edge, Config
 # First create a graph using the Barabasi-Albert model
 n = 2000
 m = 2
-G = nx.generators.barabasi_albert_graph(n, m)
+G = nx.generators.barabasi_albert_graph(n, m, seed=2023)
 
 # Then find the node with the largest degree; 
 # This node's egonet will be the focus of this example.