Update animation tracks page for Godot 4.4

[skyace65]

Technically for 4.4 since two of the images needed to be updated for the new FPS option. Other ones needed to be updated for reasons that have probably been in a few prior releases. All images have gone through squoosh compression.

• Updated two images for the snap to FPS option in the animation editor
• Replaced one because the right click menu got the cut and copy option
• Replaced one image for the new audio stream player icon from Godot 4.3
• Also added clarification to the right click menu instructions. When I was going through the page I thought I could just right click anywhere or right click with a handle selected, but the key specifically has to be selected

[skyace65]

Fixed

[mhilbrunner]

Thanks!