feat(clipboard): remove copy as output source

Author: bashbunni

README.md

@@ -165,7 +165,6 @@ Copy the output image to your clipboard, so you can paste it anywhere.
 
 ```bash
 freeze main.go --output clipboard
-freeze main.go --output copy
 ```
 
 ### Font

main.go

@@ -396,7 +396,7 @@ func main() {
 	istty := isatty.IsTerminal(os.Stdout.Fd())
 
 	outputName := config.Output
-	if config.Output == "clipboard" || config.Output == "copy" {
+	if config.Output == "clipboard" {
 		outputName = "clipboard.png"
 	}
 	switch {

png.go

@@ -48,7 +48,7 @@ func libsvgConvert(doc *etree.Document, _, _ float64, output string) error {
 		if err != nil {
 			return err
 		}
-		err = copyToClipboard(png)
+		return copyToClipboard(png)
 	}
 	return err //nolint: wrapcheck
 }
@@ -114,10 +114,7 @@ func resvgConvert(doc *etree.Document, w, h float64, output string) error {
 	}
 
 	if output == "clipboard" {
-		err = copyToClipboard(png)
-	} else {
-		err = os.WriteFile(output, png, 0o600)
+		return copyToClipboard(png)
 	}
-
-	return err //nolint: wrapcheck
+	return os.WriteFile(output, png, 0o600)
 }