fix(header) : align menu links in firefox 115

src/app/header/header.component.scss

@@ -62,6 +62,8 @@ a {
   color: $grey-2;
   height: 100%;
   align-content: center;
+  // "display: grid;" : aligns menu link items vertically in Firefox 115 (current metropole version) without affecting any other style/layout. Can be removed when Firefox is upgraded.
+  display: grid;
   &:hover {
     text-decoration: none !important;
     font-weight: bold;