move everything to backend folder for migration to dashboard repository

backend/web/templates/error.html

@@ -0,0 +1,23 @@
+{% extends 'base.html' %}
+
+{% block content %}
+
+<script>
+    var api_url = '{{ api_url }}';
+
+    // Actions
+    $(document).ready(function() {
+        flow_settings();
+    });
+
+</script>
+
+<h2>Error: {{ error_message['error']['status'] }}</h2>
+
+
+<div class=error-div>
+    {{ error_message['error']['message'] }}
+    {{ error_message['error']['reason'] }}
+</div>
+{% endblock %}
+