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/assets/images/icons/outline/folder-open.svg

@@ -0,0 +1,3 @@
+<svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="1.5" stroke="currentColor" aria-hidden="true">
+  <path stroke-linecap="round" stroke-linejoin="round" d="M3.75 9.776c.112-.017.227-.026.344-.026h15.812c.117 0 .232.009.344.026m-16.5 0a2.25 2.25 0 00-1.883 2.542l.857 6a2.25 2.25 0 002.227 1.932H19.05a2.25 2.25 0 002.227-1.932l.857-6a2.25 2.25 0 00-1.883-2.542m-16.5 0V6A2.25 2.25 0 016 3.75h3.879a1.5 1.5 0 011.06.44l2.122 2.12a1.5 1.5 0 001.06.44H18A2.25 2.25 0 0120.25 9v.776"/>
+</svg>