add Tracks route to app

ref #23

src/App.svelte

@@ -78,6 +78,12 @@ import TracksOverview from "./components/TracksOverview.svelte";
         <Route path="/users">
           <Users />
         </Route>
+        <Route path="/tracks/*">
+          <Route path="/">
+            <TracksOverview />
+          </Route>
+          <Route path="/:trackid" let:params />
+        </Route>
         <Route path="/runners">
           <Runners />
         </Route>