fix: exclude doctypes + xml headers from svg sprite (#351)

Author: jacobparis

other/build-icons.ts

@@ -115,7 +115,7 @@ async function generateSvgSprite({
 			svg.removeAttribute('width')
 			svg.removeAttribute('height')
 
-			return root.toString().trim()
+			return svg.toString().trim()
 		}),
 	)
 
@@ -127,6 +127,7 @@ async function generateSvgSprite({
 		...symbols,
 		`</defs>`,
 		`</svg>`,
+		'', // trailing newline
 	].join('\n')
 
 	return writeIfChanged(outputPath, output)