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/variable.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="M4.745 3A23.933 23.933 0 003 12c0 3.183.62 6.22 1.745 9M19.5 3c.967 2.78 1.5 5.817 1.5 9s-.533 6.22-1.5 9M8.25 8.885l1.444-.89a.75.75 0 011.105.402l2.402 7.206a.75.75 0 001.104.401l1.445-.889m-8.25.75l.213.09a1.687 1.687 0 002.062-.617l4.45-6.676a1.688 1.688 0 012.062-.618l.213.09"/>
+</svg>