Bug fixes and improvements

Bugs 🐛

Nobody likes bugs, especially when you have a day full of meetings and the application window won't move out of the way! Fear not, it is now draggable!

Improvements ✨

The About menu item has been improved to give you more information about the application, along with some helpful links and technical gubbins for reporting any pesky bugs!

Thanks for checking out Deskcal!

Released with ❤️