Added support for terminal default, and updated the default config to…

… reflect that

config/config.go

@@ -349,9 +349,15 @@ func Init() error {
 			if !ok {
 				return fmt.Errorf(`value for "%s" is not a string: %v`, k, v)
 			}
-			color := tcell.GetColor(strings.ToLower(colorStr))
-			if color == tcell.ColorDefault {
-				return fmt.Errorf(`invalid color format for "%s": %s`, k, colorStr)
+			colorStr = strings.ToLower(colorStr)
+			var color tcell.Color
+			if colorStr == "none" {
+				color = tcell.ColorDefault
+			} else {
+				color = tcell.GetColor(colorStr)
+				if color == tcell.ColorDefault {
+					return fmt.Errorf(`invalid color format for "%s": %s`, k, colorStr)
+				}
 			}
 			SetColor(k, color)
 		}

default-config.toml

@@ -302,6 +302,8 @@ entries_per_page = 20
 # This section is for changing the COLORS used in Amfora.
 # These colors only apply if 'color' is enabled above.
 # Colors can be set using a W3C color name, or a hex value such as "#ffffff".
+# Setting a color to "none" keeps the terminal default
+# If your terminal has transparency, set bg to "none" to keep it transparent
 
 # Note that not all colors will work on terminals that do not have truecolor support.
 # If you want to stick to the standard 16 or 256 colors, you can get
@@ -320,6 +322,7 @@ entries_per_page = 20
 # EXAMPLES:
 # hdg_1 = "green"
 # hdg_2 = "#5f0000"
+# bg = "none"
 
 # Available keys to set: