Added comments to main.py and removed hardcoded values from display.py to globals.py

[hlai1]

Changes

• added comments to main.py to increase readability
• removed the hardcoded values from display.py (numBars, delay, time_taken, etc.) and moved them to globals.py
• imported hardcoded values from globals.py to display.py for usage

Why (resolves https://github.com/LucasPilla/Sorting-Algorithms-Visualizer/issues/176)

• Increases readability of code
• Makes code cleaner and more module
• Global definitions are easier to reuse across multiple modules

How

• Went through main.py to understand logic, then commented the file
• Created globals.py file, moved the hardcoded values from display.py over
• Imported the values from globals.py into display.py for usage throughout the file

Testing

• Ran the data visualizer again, confirmed that functionalities still operated the same as before (timer, switching sorting types, etc.)