Fix relative urls in network map.

compendium-frontend/src/pages/NetworkMapUrls.tsx

@@ -28,8 +28,13 @@ function NetworkMapUrlPage(): React.ReactElement {
         coloredYears
     />
 
-    const showYears = [...filterSelection.selectedYears.filter(year => years.has(year))].sort();
-
+    const addHttpIfMissing = (url: string) => {
+        // check if it has a protocol, if not add http (href becomes relative to the current page, so we need to add the protocol to make it work properly)
+        if (!url.match(/^[a-zA-Z]+:\/\//)) {
+            return 'http://' + url;
+        }
+        return url;
+    }
     return (
         <DataPage title="NREN Network Maps"
             description="This table provides links to NREN network maps, showing layers 1, 2, and 3 of their networks."
@@ -57,7 +62,7 @@ function NetworkMapUrlPage(): React.ReactElement {
                                                     {yearMap.urls && yearMap.urls.map((url, index) => (
                                                         <li key={index}>
                                                             {url && (
-                                                                <a href={url} target="_blank" rel="noopener noreferrer"
+                                                                <a href={addHttpIfMissing(url)} target="_blank" rel="noopener noreferrer"
                                                                     style={{ textDecoration: 'none' }}>
                                                                     {url}
                                                                 </a>