Revert "Preview: Pack alternative icon examples into a collapsible"

This reverts commit ee24a96f083b23f90a161d22b2ff17a289ce236d.
Revert "App: Add preview UI elements showcasing alternative icon color"

This reverts commit 464c56557f3298a978f1ff1ba9cef9f7f2c25289.
1.4.2 preview: Add checkbox to allow the display of alternative icons
1.4.2 preview: Get rid of whitespace on blank lines