Disable mangling/escaping of autolinked email address

Fixes #4

public/index.html

@@ -160,7 +160,7 @@ const userLink = {
 		return `--- //[[user:${token.username}]]//`;
 	}
 };
-marked.use({extensions: [userLink]});
+marked.use({extensions: [userLink], mangle: false});
 
 function convert_text() {
 	let input = document.getElementById("text-input").value;