web: mark external links in the sidebar as external

This adds a little icon to the links that helps avoid confusion when
clicking the link takes you out of the LXA TAC web ui.

Signed-off-by: Leonard Göhrs <l.goehrs@pengutronix.de>

Author: hnez

web/src/App.tsx

@@ -105,16 +105,19 @@ function Navigation() {
             items: [
               {
                 type: "link",
+                external: true,
                 text: "Files in /srv/www",
                 href: `/srv`,
               },
               {
                 type: "link",
+                external: true,
                 text: "LXA IOBus Server",
                 href: `http://${window.location.hostname}:8080/`,
               },
               {
                 type: "link",
+                external: true,
                 text: "LXA TAC Manual",
                 href: "https://www.linux-automation.com/lxatac-M02/index.html",
               },