docs: add CoreUI Icons

Author: mrholek

docs/layouts/partials/head.html

@@ -19,3 +19,7 @@
 {{ partial "favicons" . }}
 {{ partial "social" . }}
 {{ partial "analytics" . }}
+
+<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@coreui/[email protected]/css/free.min.css" integrity="sha256-vejWHgYduBq3SYXJHSWSRJp7ktQpZ6d+8HGFtb9Fz9k=" crossorigin="anonymous">
+
+