Credits update, moved skip button, and audio fix (hopefully)

Adding updated credits picture for Edo.
Making skip tutorial button get in the way less in full screen mode.
Fixing weird audio issue that doesn't seem to be reproducible on the programmer's machine, maybe?
(Maybe fixed by switching default web export playback type from sample to stream based on this forum post https://forum.godotengine.org/t/animation-player-doesnt-stop-playing-in-browser/...
Note that this fixed the issue with reverb not working at all in the web build, but may cause audio stuttering)