Update material_deep_teal_500 to #008577.

Better for accessibility.

Also update some direct usage of the old value to use canonical versions.

Also deleted some unused assets including a 130KB!!! png that was unused.

Bug: 74118164
Test: asset swap
Change-Id: I17e0f191ac44def71e5c83193db39def28f3f7f9
4 files changed