Upgrade to mkdocs-material 5.x

docs.it4i/src/css.css

-.md-icon--edit:before {
-    content: "edit";
+.md-nav__icon.md-icon svg {
+  height: 0.6rem;
 }
 
-.md-icon--check:before {
-    content: "check";
-}
-
-.md-icon--help:before {
-    content: "help";
+.md-nav__icon.md-icon {
+  float: left;
+  padding-right: .2rem;
 }
 
 .md-nav__it4i_link {
@@ -151,5 +148,4 @@ html .md-nav__it4i_link[for=toc],html .md-nav__it4i_link[for=toc]+.md-nav__it4i_
         -webkit-transform: rotateX(180deg);
         transform: rotateX(180deg)
     }
-
 }