public function edit()
{
    $website = Website::find(1);

    if (empty($website))
        return view('backend.website.edit');
    else
        return view('backend.website.edit', compact('website'));
}

public function update(Request $request)
{
    // 因為沒有特別建立create頁面，所以特別判斷資料庫中是否有資料可以更新
    $website = Website::find(1);

    if (empty($website)) {
        // 沒有資料 -> 新增
        $website = new Website;
    }

    $website->title = $request->input('title');
    $website->subtitle = $request->input('subtitle');
    $website->footer = $request->input('footer');

    $website->save();

    return redirect()->route('admin.website.edit');
}