Revert "Audio Feather fully converted to HTML5 with smart fallback"

This reverts commit 956ee89d6ade75e7429e358fc3bd68ab9efc0bbc.
Revert "Some multi-format love for the audio Feather"

This reverts commit 46b52403ddc9b05976a64fcff9e937a4c315e7f4.