Remove Referer header when clicking on shortlinks.

This both hides the origin's hostname from external servers, and fixes
referer checks in some services (like the qBittorrent web UI).

ui/src/EditPage/Link/Link.tsx

@@ -12,7 +12,7 @@ export const Link = ({ name, host }: LinkProps) => {
   return (
     <div className={css.root}>
       <div className={css.link}>
-        <a href={url}>{url}</a>
+        <a href={url} rel="noreferrer">{url}</a>
       </div>
       <Copy text={url} />
     </div>

ui/src/LinksPage/LinksView/ShortLink/ShortLink.tsx

@@ -7,7 +7,7 @@ export interface ShortLinkProps {
 export const ShortLink = ({ url }: ShortLinkProps) => {
   return (
     <div className={css.shortlink}>
-      <a href={ensureHttp(url)}>{stripScheme(url)}</a>
+      <a href={ensureHttp(url)} rel="noreferrer">{stripScheme(url)}</a>
     </div>
   );
 };