Refactor network.py

[bhavyapan]

• changed plot_network_graph function - it was throwing up multiple errors due to specifications of the NetworkX library not aligning with the Plotly objects created for creating the interactive visualizations
• refactored the script in general for clarity and added comments wherever needed
• addressed raised Issues/TO-DOs in the file for clarity
• currently working on the create_network_graph function to understand why classification values are not factoring in the visualization created
• working on improving the visualization on accounts for -- shape and size of nodes corresponding to entities, adding arrows to indicate direction of transactions, adding color to nodes for classification values, and changing the edges configuration to reflect the size of the transaction

[trevorspreadbury]

closing this and moving it to https://github.com/dsi-clinic/2024-winter-climate-cabinet-campaign-finance-tracker/pull/59