Update appearance of external links

static/jsonp.js

@@ -65,7 +65,8 @@ async function cont() {
 		document.getElementById("content").replaceWith(imported)
 		document.title = xhr.responseXML.title
 		for (const e of xhr.responseXML.head.children) {
-			if (["LINK"].includes(e.tagName)) {
+			const alreadyImported = [...document.querySelectorAll("link[href]")].map(e => e.href)
+			if (e.tagName === "LINK" && !alreadyImported.includes(e.href)) {
 				const imported = document.importNode(e, true)
 				document.head.appendChild(imported)
 			}

static/main.css

@@ -174,13 +174,13 @@ img {
 }
 
 /* indicate wikipedia links */
-.extiw::after, .external::after {
+svg.external {
     vertical-align: super;
-    content: "[🡕]";
-    font-family: serif;
-    font-size: smaller;
 }
 .extiw[href*="wikipedia.org"]::after {
+    vertical-align: super;
+    font-family: serif;
+    font-size: smaller;
     content: "[W]";
 }