Add automated warning and banning

src/constants.rs

@@ -8,3 +8,6 @@ pub const COLOR_WHITE: u32 = 0xE2D9D0;
 
 /// A red color used for error messages and moderator embeds.
 pub const COLOR_RED: u32 = 0xFF8787;
+
+/// A yellow color used for mask notifications and warnings.
+pub const COLOR_YELLOW: u32 = 0xFFC868;