images in what's new need to be shrunk to reasonable size prior to adding to repo

[butlerpd]

Describe the bug
As @lucas-wilkins figured out on first implementing the what's new feature, the native window being used does a terrible job of resizing images. The current images are sized very much larger than the default what's new window and the native shrinking loses all resolution. These need to be sized to something like 500pixels as I recall? maybe it is less? But it must be done in a proper graphics program and then saved back out.

Expected behavior
The images should be legible immediately when the what's new pop up appears. It should not require maximizing the window.

Screenshots

SasView version (please complete the following information):

• Version: 6.2.0a3

Operating system (please complete the following information):

• OS: Windows 11

Installation method (please complete the following information):

• Installed: windows installer from github release page