Update menu bar and copyright

[infinitepower18]

Made the following changes to the menu bar:

• Removed menu bar items that never worked in the app
• Replaced non functioning help button with a link to the app's GitHub issues

Also updated copyright year.

https://github.com/Dimillian/IceCubesApp/assets/44692189/2efdb9da-a996-4c30-b842-87683ccff369

[Dimillian]

Nice!