feat: Update joinGame endpoint to accept gameId as a path parameter

src/views/JoinGameView.vue

@@ -14,8 +14,7 @@ const startGameQuasar = async() => {
     return;
   }
   isLoading.value = true;
-  axios.post(`${api}/joinGame`, {gameId: lobbyCode.value.toString()}, {withCredentials: true}).then(response => {
+  axios.post(`${api}/joinGame/${lobbyCode.value.toString()}`, {}, {withCredentials: true}).then(() => {
-    const responseData = response.data
     $q.notify({
       message: `Lobby "${lobbyCode.value}" erfolgreich gefunden`,
       color: 'green-6',