:bug: make link for icons relative

frontend/assets/sass/icons.scss

 @font-face {
     font-family: 'icomoon';
-    src: url('assets/fonts/icomoon.eot?6rmrq3');
-    src: url('assets/fonts/icomoon.eot?6rmrq3#iefix') format('embedded-opentype'),
-        url('assets/fonts/icomoon.ttf?6rmrq3') format('truetype'),
-        url('assets/fonts/icomoon.woff?6rmrq3') format('woff'),
-        url('assets/fonts/icomoon.svg?6rmrq3#icomoon') format('svg');
+    src: url('./fonts/icomoon.eot?6rmrq3');
+    src: url('./fonts/icomoon.eot?6rmrq3#iefix') format('embedded-opentype'),
+        url('./fonts/icomoon.ttf?6rmrq3') format('truetype'),
+        url('./fonts/icomoon.woff?6rmrq3') format('woff'),
+        url('./fonts/icomoon.svg?6rmrq3#icomoon') format('svg');
     font-weight: normal;
     font-style: normal;
     font-display: block;