help: Update Main Window Manual Page

Previously the Main Window Manual page was out of date,
partly out of order and not as informative as it could be.

This can prevent new users from easily understanding
the Main Window's features.

To address this, We have created an updated graphic,
reorganized the layout, rewrote descriptions, renamed sections
of the main window, and added helpful tips.
1 job for main_window_manual in 14 minutes and 12 seconds