Added icons, helperfunction and new fancy notice message

Added icons from webcrunch resp. heroicons
Added helperfunction to display inline svg with the plugin inline-svg
Implemented fancy notice message webcrunch. Realy nice but does only
work with javascript on.

app/views/layouts/_flashold.html.erb

@@ -0,0 +1,10 @@
+<div id="notice">
+  <% if notice.present? %>
+    <div class="flex p-1.5 text-l bg-green-100  text-green-700 font-medium shadow-lg border-l-4 border-green-700>
+      <span class="flex p-1.5"><%= icon "check", class: "size-8 stroke-primary-500" %></span>
+      <p class="p-1.5">
+        <%= notice %>
+      </p>
+    </div>
+  <% end %>
+</div>