Further UI improvements (#8)

* Only set autosign in cookie upon clicking the button

* Show an already signed in link if you already have a token

custom_components/auth_oidc/views/error.html

@@ -8,7 +8,7 @@
     <h1 class="text-2xl font-bold mb-4">Login failed.</h1>
     <p class="mb-4">{{ error }}</p>
     <div class="my-6">
-        <a href='{{ link }}'
+        <a href='/auth/oidc/redirect'
             class="w-full py-2 px-4 bg-blue-500 text-white font-semibold rounded-lg shadow-md hover:bg-blue-700 focus:outline-none focus:ring-2 focus:ring-blue-400 focus:ring-opacity-75">Try
             again</a>
     </div>