Add styling based on what PST does

Author: agriyakhetarpal

assets/theme-css/footer.css

@@ -39,6 +39,14 @@
   color: var(--spht-color-link-hover);
 }
 
+.footer-item a.nav-external::after {
+  font: var(--fa-font-solid);
+  content: "\f35d";
+  font-size: 0.75em;
+  margin-left: 0.3em;
+  display: inline-block;
+}
+
 .footer-actions {
   max-width: 25vw;
   margin: 1.25rem 1.563rem;

assets/theme-css/navbar.css

@@ -42,6 +42,15 @@ a.navbar-item:hover,
   text-decoration-thickness: max(3px, 0.1875rem, 0.12em);
 }
 
+a.navbar-item.nav-external::after,
+.navbar-dropdown a.navbar-item.nav-external::after {
+  font: var(--fa-font-solid);
+  content: "\f35d";
+  font-size: 0.75em;
+  margin-left: 0.3em;
+  display: inline-block;
+}
+
 .navbar-burger {
   font-family: inherit;
   font-size: 1em;