Better Errorhandling in case of spotify api errors

Addresses issue #20

templates/items.html

@@ -1,6 +1,16 @@
 {% extends "base.html" %}
 
 {% block content %}
+{% if error_message %}
+<div class="alert alert-danger mt-5" role="alert">
+    <h4 class="alert-heading">🚨Something went wrong🚨</h4>
+    <p>{{ error_message }}</p>
+    <hr>
+    <p>Additional Information:</p>
+    <p>{{error_data}}</p>
+    
+</div>
+{% else %}
 <h1 class="mb-4">{{ items_title }}</h1>
 <h6 class="mb-4">{{ items_subtitle }}</h6>
 <div class="row row-cols-1 row-cols-md-4 row-cols-lg-6 g-4" id="items-container">
@@ -8,5 +18,6 @@
     
 </div>
 
+{% endif %}
 
 {% endblock %}